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Components of Accumulated Other Comprehensive Loss Dilution of Equity Method Investment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Income tax expense | $ 11,234 | $ 12,000 | $ 17,487 | $ 9,834
Amount Reclassified from Accumulated Other Comprehensive Loss |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Total before tax |  |  |  | 4,813
Income tax expense |  |  |  | (1,776)
Total amounts reclassified from accumulated other comprehensive loss in connection with loss on dilution of equity method investment |  |  |  | 3,037
Amount Reclassified from Accumulated Other Comprehensive Loss | Foreign exchange translation adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Total before tax |  |  |  | 4,880
Amount Reclassified from Accumulated Other Comprehensive Loss | Cash flow hedging instruments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Total before tax |  |  |  | 168
Amount Reclassified from Accumulated Other Comprehensive Loss | Defined benefit pension obligations |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Total before tax |  |  |  | $ (235)

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