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Stockholder's Equity (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Changes in stockholders' equity        
Beginning Balance     $ 183,155  
Net income 11,642 (2,778) 25,459 4,755
Net unrealized gains on available-for-sale securities, net of tax (89) 2 (54) 129
Conversion of Series B preferred shares     35,217 0
Taxes paid related to net share settlement of restricted stock units     11,280 720
Ending Balance 236,697   236,697  
Total Equity Attributable to Share holders [Member]
        
Changes in stockholders' equity        
Beginning Balance     183,155  
Net income     25,459  
Net unrealized gains on available-for-sale securities, net of tax     (54)  
Conversion of Series B preferred shares     35,217  
Treasury stock repurchases     (3,059)  
Issuance of common stock related to stock transactions     2,339  
Taxes paid related to net share settlement of restricted stock units     (11,280)  
Stock-based compensation     4,920  
Ending Balance $ 236,697   $ 236,697