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Equity-Based Compensation - Text (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense for non-vested equity-based compensation $ 4,400,000      
End of period, share price $ 18.83      
Stock based compensation expense, recognition period 15 months      
2010 Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Years of annual installments in which stock options become exercisable 4 years      
Number of shares authorized 900,000      
Number of shares available for grant 216,000      
Exercised (in shares) (2,875) (20,750) 0  
Intrinsic value of shares exercised 17,000 55,000    
Number of options outstanding and exercisable (in shares) 660,471 461,346 265,500 0
Aggregate intrinsic value 2,372,081      
Weighted average remaining contractual life 10 years 8 months      
2010 Plan [Member] | Minimum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 1 year      
2010 Plan [Member] | Maximum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 15 years      
Equity Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for grant 0      
Exercised (in shares) (107,775) (574,353) (660,338)  
Intrinsic value of shares exercised 1,600,000 7,400,000 6,000,000  
Number of options outstanding and exercisable (in shares) 2,472,147 2,584,547 3,175,075 3,895,475
Aggregate intrinsic value 34,999,189      
Weighted average remaining contractual life 4 years 8 months      
Equity Plan [Member] | Minimum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Years of annual installments in which stock options become exercisable 3 years      
Award vesting period 1 year      
Equity Plan [Member] | Maximum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Years of annual installments in which stock options become exercisable 4 years      
Award vesting period 15 years      
1991 Plan Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 4 years      
Number of shares authorized 800,000      
Number of shares available for grant 180,000      
Weighted-average fair value on the date of grant of stock options granted $ 5.78 $ 5.47 $ 4.57  
Annual vesting percentage 25.00%      
Intrinsic value of shares exercised     300,000  
Number of options outstanding and exercisable (in shares) 141,880      
Aggregate intrinsic value $ 1,700,000      
Weighted average remaining contractual life 1 year 7 months      
1991 Plan Options [Member] | Range of Exercise Prices, $2.88 – $6.00 [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of options outstanding and exercisable (in shares) 127,000      
Exercise price range, lower limit $ 2.88      
Exercise price range, upper limit $ 6.00      
1991 Plan Options [Member] | Range of Exercise Prices, $16.19 – $26.06 [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of options outstanding and exercisable (in shares) 15,000      
Exercise price range, lower limit $ 16.19      
Exercise price range, upper limit $ 26.06