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Retirement Plans - Net Pension Income Domestic and Foreign (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Pension Plans        
Net pension expense (income)        
(Income) expense, net $ 78 $ (491) $ 157 $ (924)
Foreign Plan [Member]        
Net pension expense (income)        
Service cost 11 12 22 24
Interest cost 11 9 22 17
Defined Benefit Plan, Expected Return on Plan Assets, Net of Expenses (6) (5) (13) (10)
Amortization of loss 40 39 82 77
(Income) expense, net 56 55 113 108
Domestic Plan [Member]        
Net pension expense (income)        
Interest cost 1,781 2,068 3,562 4,136
Defined Benefit Plan, Expected Return on Plan Assets, Net of Expenses (3,225) (4,060) (6,450) (8,121)
Amortization of loss 1,466 1,446 2,932 2,892
Other cost due to retirement     0 61
(Income) expense, net $ 22 $ (546) $ 44 $ (1,032)