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, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Summary of changes in shareholders' equity        
Balance     $ 488,912 $ 499,995
Balance, shares 35,590,401   35,590,401  
Net income/(loss) 6,784 (3,235) 10,035 (9,332)
Exercise of stock options     3,900 1,831
Exercise of stock options, shares 179,832 3,000 259,132 119,600
Equity award compensation expense     6,095 5,215
Issuance of restricted stock     0 0
Issuance of stock, shares 2,645,000      
Issuance of stock, value     87,125 [1]  
Cancellation of treasury shares, value     0 [2]  
Balance 596,067 497,709 596,067 497,709
Balance, shares     40,377,021  
Common Stock [Member]
        
Summary of changes in shareholders' equity        
Balance     404 400
Balance, shares 35,590,000 40,316,000 35,590,000 40,316,000
Net income/(loss)     0 0
Exercise of stock options     3 1
Exercise of stock options, shares     259,000 119,000
Equity award compensation expense     0 0
Issuance of restricted stock, shares     200,000 167,000
Issuance of restricted stock     2 2
Issuance of stock, shares     2,645,000 [1]  
Issuance of stock, value     26 [1]  
Cancellation of treasury shares (shares)     (7,891,000) [2]  
Cancellation of treasury shares, value     (79) [2]  
Balance 356 403 356 403
Balance, shares     40,377,000 40,030,000
Additional Paid In Capital [Member]
        
Summary of changes in shareholders' equity        
Balance     478,839 468,820
Net income/(loss)     0 0
Exercise of stock options     3,897 1,830
Equity award compensation expense     6,095 5,215
Issuance of restricted stock     (2) (2)
Issuance of stock, value     87,099 [1]  
Cancellation of treasury shares, value     (188,694) [2]  
Balance 387,234 475,863 387,234 475,863
Retained Earnings [Member]
        
Summary of changes in shareholders' equity        
Balance     198,442 219,548
Net income/(loss)     10,035 (9,332)
Exercise of stock options     0 0
Equity award compensation expense     0 0
Issuance of restricted stock     0 0
Issuance of stock, value     0 [1]  
Cancellation of treasury shares, value     0 [2]  
Balance 208,477 210,216 208,477 210,216
Treasury Stock [Member]
        
Summary of changes in shareholders' equity        
Balance     (188,773) (188,773)
Net income/(loss)     0 0
Exercise of stock options     0 0
Equity award compensation expense     0 0
Issuance of restricted stock     0 0
Issuance of stock, value     0 [1]  
Cancellation of treasury shares, value     188,773 [2]  
Balance $ 0 $ (188,773) $ 0 $ (188,773)
[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] During the third quarter of 2012, we canceled and retired all of our treasury shares. These shares remain as authorized and unissued shares.