Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details)

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Stockholders' Equity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance     $ 694,210 $ 488,912
Balance, shares     35,613,351  
Net earnings/(loss) 38,191 6,784 78,375 10,035
Exercise of stock options     11,225 3,900
Exercise of stock options, shares 12,400 179,832 334,500 259,132
Equity award compensation expense     7,040 6,095
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation     1,733  
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures     0 0
Stock Issued During Period, Value, New Issues       87,125 [1]
non-controlling interest acquisition     (257)  
Cancellation of treasury shares (shares)       (7,891,000) [2]
Cancellation of treasury shares, value       0 [2]
Balance 792,326 596,067 792,326 596,067
Balance, shares 36,231,201   36,231,201  
Common Stock [Member]
        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance     356 404
Balance, shares     35,613,000 40,377,000
Net earnings/(loss)     0 0
Exercise of stock options     3 3
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net     0  
Exercise of stock options, shares     335,000 259,000
Equity award compensation expense     0 0
Stock Issued During Period, shares, Restricted Stock Award     283,000 200,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures     3 2
Stock Issued During Period, Shares, New Issues       2,645,000 [1]
Stock Issued During Period, Value, New Issues       26 [1]
non-controlling interest acquisition     0  
Cancellation of treasury shares, value       (79) [2]
Balance 362 356 362 356
Balance, shares 36,231,000 35,590,000 36,231,000 35,590,000
Additional Paid In Capital [Member]
        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance     390,249 478,839
Net earnings/(loss)     0 0
Exercise of stock options     11,222 3,897
Equity award compensation expense     7,040 6,095
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation     1,733  
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures     (3) (2)
Stock Issued During Period, Value, New Issues       87,099 [1]
non-controlling interest acquisition     (257)  
Cancellation of treasury shares, value       (188,694) [2]
Balance 409,984 387,234 409,984 387,234
Retained Earnings [Member]
        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance     303,605 198,442
Net earnings/(loss)     78,375 10,035
Exercise of stock options     0 0
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net     0  
Equity award compensation expense     0 0
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures     0 0
Stock Issued During Period, Value, New Issues       0 [1]
non-controlling interest acquisition     0  
Cancellation of treasury shares, value       0 [2]
Balance 381,980 208,477 381,980 208,477
Treasury Stock [Member]
        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance       (188,773)
Net earnings/(loss)       0
Exercise of stock options       0
Equity award compensation expense       0
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures       0
Stock Issued During Period, Value, New Issues       0 [1]
Cancellation of treasury shares, value       188,773 [2]
Balance   $ 0   $ 0
[1] (1) In July 2012, we issued a public offering of 2,645,000 shares of common stock, par value $0.01 per share, at a price to the public of $34.75 per share.
[2] (2) During the third quarter of 2012, we canceled and retired all of our treasury shares. These shares remain as authorized and unissued shares.