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
Mar. 31, 2013
Mar. 31, 2012
Summary of changes in shareholders' equity    
Balance $ 694,210 $ 488,912
Balance, shares 36,010,224  
Net income/(loss) 12,041 (4,754)
Exercise of stock options 3,078 1,055
Exercise of stock options, shares 122,273 68,700
Equity award compensation expense 1,844 1,653
Issuance of restricted stock   0
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation 464  
Issuance of stock, value 0  
Balance 711,637 486,866
Balance, shares 35,613,351  
Common Stock [Member]
    
Summary of changes in shareholders' equity    
Balance 356 404
Balance, shares 36,010,000 40,640,000
Net income/(loss) 0 0
Exercise of stock options 1 1
Exercise of stock options, shares 122,000 69,000
Equity award compensation expense 0 0
Issuance of restricted stock, shares   194,000
Issuance of restricted stock   1
Issuance of stock, shares 275,000  
Issuance of stock, value 3  
Balance 360 406
Balance, shares 35,613,000 40,377,000
Additional Paid In Capital [Member]
    
Summary of changes in shareholders' equity    
Balance 390,249 478,839
Net income/(loss) 0 0
Exercise of stock options 3,077 1,054
Equity award compensation expense 1,844 1,653
Issuance of restricted stock   (1)
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation 464  
Issuance of stock, value (3)  
Balance 395,631 481,545
Retained Earnings [Member]
    
Summary of changes in shareholders' equity    
Balance 303,605 198,442
Net income/(loss) 12,041 (4,754)
Exercise of stock options   0
Equity award compensation expense 0 0
Issuance of restricted stock 0 0
Issuance of stock, value 0  
Balance 315,646 193,688
Treasury Stock [Member]
    
Summary of changes in shareholders' equity    
Balance 0 (188,773)
Net income/(loss) 0 0
Exercise of stock options   0
Equity award compensation expense 0 0
Issuance of restricted stock 0 0
Issuance of stock, value 0  
Balance $ 0 $ (188,773)