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Stockholders' Equity (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 04, 2006
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum percentage before exercise       20.00%
Number of shares authorized for issuance 7,500,000      
Maximum vesting period ten      
Option vesting period four      
Total fair value of restricted stock units vested $ 2,400,000 $ 200,000 $ 400,000  
Number of Shares, vested 51,606      
Stock appreciation rights term (in years) 10      
Stock appreciation rights outstanding 101,617 173,119    
Recognized excess tax benefits related to stock-based compensation   278,000 714,000  
Warrants [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock repurchased 22,904      
Weighted-average exercise price of options, per share $ 6.92      
Stock Appreciation Rights [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock appreciation rights outstanding 262,800      
Equity Incentive Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Aggregate grant date fair value of awards $ 27,700,000      
Weighted-average period of non-cash compensation expense recognized (in years) 2.68      
Maximum [Member] | Warrants [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Warrants expiration date 2017      
Minimum [Member] | Warrants [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Warrants expiration date 2014