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Employee Retirement Plans (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 140 $ 375
Interest cost 548 614
Expected return on plan assets (542) (584)
Net amortization and deferral 120 362
Net periodic benefit cost $ 266 $ 767