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Schedule II - Valuation and Qualifying Accoutns (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
SEC Schedule, 12-09, Valuation Allowances and Reserves, Period Increase (Decrease) $ 4,413 $ (47) $ 8,126
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Valuation Allowances and Reserves, Balance Period Start 66,356 66,403 58,277
Deductions 0 0 0
Valuation Allowances and Reserves, Balance Period End 70,769 66,356 66,403
SEC Schedule, 12-09, Allowance, Credit Loss [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense 11,527 11,174 3,785
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Valuation Allowances and Reserves, Balance Period Start 25,549 23,367 24,418
Deductions (10,363) (8,992) (4,836)
Valuation Allowances and Reserves, Balance Period End $ 26,713 $ 25,549 $ 23,367