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Employee Benefit Plans (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Options Outstanding, Number of Options    
Balance, December 31, 2011 2,265,842  
Granted 0  
Balance, December 31, 2012 2,234,963 2,265,842
Options Outstanding, Weighted Average Exercise Price    
Balance, December 31, 2011 (in dollars per share) $ 12.82  
Granted (in dollars per share) 0.00  
Exercised (in dollars per share) 25.10  
Forfeited (in dollars per share) 0.00  
Balance, December 31, 2012 (in dollars per share) $ 12.65 $ 12.82
Options Exercisable, Number of Options    
Number of Options 2,234,963 2,265,842
Options Exercisable, Weighted Average Exercise Price    
Weighted Average Exercise Price (in dollars per share) $ 12.65 $ 12.82
Restricted Stock, Number Of shares    
Vested 0  
Restricted Stock, Weighted Average Fair Value Per Restricted Stock    
Vested (in dollars per share) $ 0  
Stock Options [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 0  
Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 3,000,000  
Options Outstanding, Number of Options    
Exercised 0  
Options Outstanding, Weighted Average Exercise Price    
Exercised (in dollars per share) $ 0  
Restricted Stock, Number Of shares    
Balance, December 31, 2011 999,978  
Granted 551,293  
Vested (736,204)  
Forfeited (14,691)  
Balance, December 31, 2012 800,376 999,978
Restricted Stock, Weighted Average Fair Value Per Restricted Stock    
Balance, December 31, 2011 (in dollars per share) $ 23.98  
Granted (in dollars per share) 32.67  
Vested (in dollars per share) 23.52  
Forfeited (in dollars per share) 23.24  
Balance, December 31, 2012 (in dollars per share) $ 30.40 $ 23.98
Outstanding [Member]    
Options Outstanding, Number of Options    
Exercised (30,879)  
Exercisable [Member]    
Options Outstanding, Number of Options    
Exercised 30,879