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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance     $ 694,210 $ 488,912
Balance, shares     35,613,351  
Net earnings/(loss) 28,143 8,005 40,184 3,251
Exercise of stock options     10,916 1,222
Exercise of stock options, shares 199,827 10,600 322,100 79,300
Equity award compensation expense     3,941 3,273
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation     1,687  
Issuance of stock, value     0 0
non-controlling interest acquisition     (257)  
Balance 750,681 496,658 750,681 496,658
Balance, shares 36,216,251   36,216,251  
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 1
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net     0  
Exercise of stock options, shares     322,000 79,000
Equity award compensation expense     0 0
Issuance of stock, shares     281,000 197,000
Issuance of stock, value     3 2
non-controlling interest acquisition     0  
Balance 362 407 362 407
Balance, shares 36,216,000 40,653,000 36,216,000 40,653,000
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     10,913 1,221
Equity award compensation expense     3,941 3,273
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation     1,687  
Issuance of stock, value     (3) (2)
non-controlling interest acquisition     (257)  
Balance 406,530 483,331 406,530 483,331
Retained Earnings [Member]
        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance     303,605 198,442
Net earnings/(loss)     40,184 3,251
Exercise of stock options       0
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures     0  
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net     0  
Equity award compensation expense     0 0
Issuance of stock, value     0 0
non-controlling interest acquisition     0  
Balance 343,789 201,693 343,789 201,693
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
Issuance of stock, value       0
Balance   $ (188,773)   $ (188,773)