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Schedule II - Valuation And Qualifying Accounts And Reserves (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowance For Doubtful Accounts [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year $ 523 $ 649 $ 784
Additions, Charged to Costs and Expenses 172 0 0
Additions, Charged to Other Accounts 0 0 0
(Deductions) 0 (126) (135)
Balance at End of Year 695 523 649
Deferred Income Tax Valuation Allowance [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 17,922 14,548 16,509
Additions, Charged to Costs and Expenses 0 0 (1,142)
Additions, Charged to Other Accounts 50,547 3,374 (819)
(Deductions) 0 0 0
Balance at End of Year $ 68,469 $ 17,922 $ 14,548