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Employee Pension Plans (Components of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Summary of net periodic benefit cost    
Interest cost $ 883 $ 975
Expected return on plan assets (1,077) (1,088)
Amortization of net loss 513 456
Other 213 213
Net periodic benefit cost 532 556
Company contribution 800 $ 800
Expected contributions remainder of current fiscal year $ 2,000