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Restructuring and Impairment Charges (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |
Other income (expense) | $ 381 | $ (299)
Restructuring and impairment charges | $ 0 | 1,357
Accounting Standards Update 2017-07 [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Other income (expense) |  | 420
Employee Severance And Other Employment Termination Costs [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges |  | $ 1,777

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