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Schedule of Amounts Recognized in the Consolidated Balance Sheets (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract] |  |
Plan assets in other long-term assets | $ 702 | $ 654
Current portion of pension benefit obligation in wages and benefits payable | 3,340 | 3,202
Long-term portion of pension benefit obligation | 93,263 | 84,498
Pension benefit obligation, net | $ 95,901 | $ 87,046

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