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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Allowance for deferred tax asset      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year $ 0 $ 1,530 $ 859
Charged to Expenses 0 0 0
Adjustments to Valuation Accounts 1,748 (1,530) 671
Deductions 0 0 0
Balance at End of Year 1,748 0 1,530
Allowance for uncollectible accounts      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 7,921 5,920 5,720
Charged to Expenses 4,402 2,532 200
Adjustments to Valuation Accounts (915) (531) 0
Deductions 0 0 0
Balance at End of Year 11,408 7,921 5,920
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