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Earnings Per Share and Dividends (Details 2) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 06, 2015
Jun. 04, 2015
Apr. 08, 2015
Jun. 05, 2014
Apr. 18, 2014
Sep. 30, 2015
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Class A common stock                    
Dividends Payable [Line Items]                    
Dividends to Class A common stockholders                 $ 20,912,000  
Cash dividends declared per share             $ 0.1250 $ 0.0625 $ 1.7500 $ 0.1250
Quarterly dividend | Class A common stock                    
Dividends Payable [Line Items]                    
Dividends to Class A common stockholders   $ 1,529,000 $ 1,500,000 $ 724,000 $ 725,000       $ 3,029,000 $ 1,449,000
Cash dividends declared per share $ 0.125               $ 0.125 $ 0.0625
Distributions declared to non-controlling unitholders   $ 2,217,000 $ 2,217,000 $ 1,108,000 $ 1,108,000          
Special dividend | Class A common stock                    
Dividends Payable [Line Items]                    
Dividends to Class A common stockholders                 $ 17,883,000  
Cash dividends declared per share                 $ 1.50  
Distributions declared to non-controlling unitholders                 $ 26,602,000  
Subsequent Event | Quarterly distribution                    
Dividends Payable [Line Items]                    
Distributions declared to non-controlling unitholders           $ 2,217,000