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 |