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Defined Benefit Plans - Net Periodic Pension Costs (Details) - Pension Plans, Defined Benefit [Member] - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Service costs $ 270   $ 290 $ 850 $ 840
Interest costs 260   310 850 950
Expected return on plan assets (340)   (370) (1,190) (1,100)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment 0 $ (2,500) 0 2,500 0
Amortization of net (gain)/loss 180   260 670 760
Net periodic benefit cost $ 370   $ 490 $ 3,680 $ 1,450