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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance for deferred tax asset      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year $ 1,530 $ 859 $ 0
Charged to Expenses 0 0 0
Adjustments to Valuation Accounts 0 671 859
Deductions (1,530) 0 0
Balance at End of Year 0 1,530 859
Allowance for uncollectible accounts      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 5,920 5,720 7,451
Charged to Expenses 2,532 200 0
Adjustments to Valuation Accounts (531) 0 0
Deductions 0 0 (1,731)
Balance at End of Year 7,921 5,920 5,720
Allowance for notes receivable      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 0 0 0
Charged to Expenses 0 0 0
Adjustments to Valuation Accounts 0 0 0
Deductions 0 0 0
Balance at End of Year $ 0 $ 0 $ 0