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Schedule II - Valuation And Qualifying Accounts And Reserves (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Allowance For Doubtful Accounts [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year $ 649 $ 784 $ 651
Additions, Charged to Costs and Expenses 0 0 133
Additions, Charged to Other Accounts 0 0 0
(Deductions) (126) (135) 0
Balance at End of Year 523 649 784
Deferred Income Tax Valuation Allowance [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 14,548 16,509 14,738
Additions, Charged to Costs and Expenses 0 (1,142) 0
Additions, Charged to Other Accounts 3,374 (819) 1,771
(Deductions) 0 0 0
Balance at End of Year $ 17,922 $ 14,548 $ 16,509