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Notes Receivable - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2008
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Effective interest rates on bonds (as a percent) 11.42%      
Total other-than-temporary impairment loss       $ 41,961
Impairment charges     $ 23,783 35,418
Less portion recognized in other comprehensive income       $ 6,543
Bonds B Series [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Effective interest rates on bonds (as a percent) 11.42%     14.00%
Total other-than-temporary impairment loss       $ 42,000
Impairment charges   $ 35,400    
Less portion recognized in other comprehensive income       $ 6,500