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Employee Retirement Plans (Schedule of Total Expense for All Retirement Plans) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract] |  |  |
Total retirement plan expense | $ 2,887 | $ 2,934 | $ 2,816

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- Definition Period expense related to postemployment benefits. + References No definition available. + Details
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