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Earnings Per Share and Dividends - Additional Information (Details) - Class A common stock - USD ($)
2 Months Ended 3 Months Ended 6 Months Ended
Aug. 03, 2016
Jun. 02, 2016
Mar. 23, 2016
Jun. 08, 2015
Jun. 04, 2015
Apr. 08, 2015
Jun. 02, 2016
Jun. 08, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dividends Payable [Line Items]                        
Dividends to Class A common stockholders                     $ 5,285,000 $ 3,029,000
Cash dividends declared per share of Class A common stock                 $ 0.1500 $ 0.1250 $ 0.3000 $ 1.7500
Quarterly dividend                        
Dividends Payable [Line Items]                        
Dividends to Class A common stockholders   $ 2,647,000 $ 2,638,000   $ 1,529,000 $ 1,500,000         $ 5,285,000  
Cash dividends declared per share of Class A common stock                     $ 0.15 0.125
Quarterly dividend | Forecast                        
Dividends Payable [Line Items]                        
Cash dividends declared per share of Class A common stock $ 0.15                      
Special dividend                        
Dividends Payable [Line Items]                        
Dividends to Class A common stockholders       $ 17,883,000                
Cash dividends declared per share of Class A common stock                       $ 1.50
Distributions declared to non-controlling unitholders       $ 26,602,000                
Quarterly distribution                        
Dividends Payable [Line Items]                        
Distributions declared to non-controlling unitholders             $ 1,884,000 $ 2,217,000