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Equity Method Investments - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Feb. 20, 2018
Oct. 30, 2017
Sep. 13, 2017
Apr. 18, 2017
Apr. 10, 2017
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Apr. 01, 2010
Equity Method Investments                        
Ownership percentage                       50.00%
Gain recognized by Company on issuance of shares                   $ 0 $ 31,971  
Income (loss) from equity method investments           $ 527   $ 2,791   3,641 4,565  
Return of capital from equity method investments                   2,737 11,672  
Corporate Joint Venture                        
Equity Method Investments                        
Gain recognized by Company on issuance of shares             $ 9,680 14,429 $ 15,170      
Income (loss) from equity method investments         $ (2,400) $ 527   2,806   $ 3,641 $ 4,592  
Return of capital from equity method investments $ 2,737     $ 11,672                
Shares issued   10,060,000 11,940,000                  
Gain recognized by Company on issuance of shares related to acquisitions               $ 92 $ 2,280      
Australian Trust                        
Equity Method Investments                        
Ownership percentage                       50.00%