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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance for Doubtful Accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Valuation Allowances and Reserves, Additions for Adjustments $ 2,851,000 $ 7,256,000 $ 0
Movement in Valuation Allowances and Reserves [Roll Forward]      
Beginning balance 7,485,000 871,000 3,210,000
Deductions (7,437,000) (642,000) (2,339,000)
Ending balance   7,485,000 871,000
Allowance for doubtful accounts 2,899,000 7,485,000 871,000
Allowance for Loan and Lease Losses [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Valuation Allowances and Reserves, Additions for Adjustments 0 0 0
Movement in Valuation Allowances and Reserves [Roll Forward]      
Beginning balance 0 0 0
Deductions 0 0 0
Ending balance $ 0 $ 0 $ 0