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Stock-Based Compensation (Narrative) (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum annual shares awarded to employee     500,000  
Maximum shares of common stock 20,000,000   20,000,000  
Shares available for granting additional awards 7,712,084   7,712,084  
Unrecognized compensation cost of non-vested stock-based compensation awards $ 6,800,000   $ 6,800,000  
Unrecognized compensation cost of non-vested stock-based compensation awards expected to be recognized over a weighted average period (years)     2 years 6 months 0 days  
Maximum period for exercisable options (years and days)     10 years 1 day  
Number of options granted     0  
Intrinsic value of stock options exercised 100,000 0 300,000 200,000
Number of restricted shares granted     0  
Fair value of restricted stock awards vested 1,000,000 500,000 1,500,000 500,000
Payments made to taxing authorities for employee tax obligations $ 394,000 $ 146,000 $ 560,000 $ 146,000
Shares withheld to settle employee tax withholding obligations     23,324  
Stock Options
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of options granted 0 0 0 0
Stock Options | Minimum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (months)     24 months  
Stock Options | Maximum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (months)     72 months  
Restricted Stock
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of restricted shares granted 0 40,000 0 45,000
Restricted Stock | Minimum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (months)     12 months  
Restricted Stock | Maximum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (months)     84 months