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Retirement Plans (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Facility
Jun. 30, 2016
USD ($)
Defined Benefit Plan Disclosure [Line Items]        
Number of facilities closed associated with the defined benefit plan | Facility     2  
Defined Benefit Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 465 $ 503 $ 926 $ 1,006
Interest cost 359 425 714 845
Expected return on plan assets (259) (300) (514) (597)
Amortization of actuarial (gain) loss (21) 55 (42) 108
Settlement expense 3,797 0 3,797 0
Total defined benefit expense $ 4,341 $ 683 $ 4,881 $ 1,362