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Equity Method Investments - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Feb. 20, 2018
Oct. 30, 2017
Sep. 13, 2017
Apr. 18, 2017
Apr. 10, 2017
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Apr. 01, 2010
Equity Method Investments                        
Ownership percentage                       50.00%
Gain recognized by Company on issuance of shares                     $ 17,450  
Income (loss) from equity method investments           $ 2,226     $ (1,330) $ 3,114 1,774  
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) $ (2,226)     (1,326) $ 3,114 $ 1,786  
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%