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Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance for doubtful accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year $ 695 $ 523 $ 649
Additions, Charged to Costs and Expenses 23 172 0
Additions, Charged to Other Accounts 0 0 0
(Deductions) 0 0 (126)
Balance at End of Year 718 695 523
Deferred income tax valuation allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 68,469 17,922 14,548
Additions, Charged to Costs and Expenses 0 0 0
Additions, Charged to Other Accounts 3,847 50,547 3,374
(Deductions) 0 0 0
Balance at End of Year $ 72,316 $ 68,469 $ 17,922