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Schedule II - Valuation And Qualifying Accounts And Reserves (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Allowance For Doubtful Accounts [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year $ 784 $ 651 $ 805
Additions, Charged to Costs and Expenses 0 133 0
Additions, Charged to Other Accounts 0 0 0
(Deductions) (135) 0 (154)
Balance at End of Year 649 784 651
Deferred Income Tax Valuation Allowance [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 16,509 14,738 6,879
Additions, Charged to Costs and Expenses (1,142) 0 (485)
Additions, Charged to Other Accounts (819) 1,771 8,344
(Deductions) 0 0 0
Balance at End of Year $ 14,548 $ 16,509 $ 14,738