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Retirement Plans - Schedule of Net Periodic Benefit Cost Not yet Recognized (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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United Kingdom Subsidiary | UK Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Unrecognized losses | $ 102,943 | $ 88,818

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- Definition After tax net amount of gain (loss) that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases (decreases) in other comprehensive income as they arise. + References No definition available. + Details
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- Details
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- Details
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