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Equity-Based Compensation (Activity for Restricted Stock Units) (Details) - USD ($)
12 Months Ended
Aug. 19, 2015
May. 20, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Oct. 31, 2013
Restricted Stock Units            
Incremental equity-based compensation expense     $ 1,453,000 $ 2,002,000 $ 2,995,000  
Estimated value of withheld shares     $ 327,000 $ 1,781,000    
Restricted Stock Units (RSUs)            
Restricted Stock Units            
Restricted Stock Units, Balance as of December 31, 2014     40,472      
Restricted Stock Units, Granted     85,680      
Restricted Stock Units, Forfeited     (6,588)      
Restricted Stock Units, Delivered and exchanged for shares of Class A common stock (7,576)   (14,866) (30,304)    
Restricted Stock Units, Cancelled     (7,933)      
Restricted Stock Units, Balance as of December 31, 2015     96,765 40,472    
Restricted Stock Units, Vested     22,799      
Restricted Stock Units, Unvested     96,765      
Incremental equity-based compensation expense     $ 1,453,000 $ 2,002,000 $ 247,000  
Shares withheld from grants to employee   30,519 7,933      
Estimated value of withheld shares   $ 818,000 $ 295,000      
Restricted Stock Units (RSUs) | President Emeritus            
Restricted Stock Units            
Restricted Stock Units, Unvested           7,576
Incremental equity-based compensation expense     $ 216,000