Defined Benefit Pension Plans - Schedule of Amounts Recognized in Other Comprehensive Income (loss), pre-tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan [Abstract]
Net actuarial (gain) loss	$ (3,191)	$ (3,209)	$ 6,316
Settlement (gain) loss	(1)	2	(1,343)
Curtailment (gain) loss	(1)	586	0
Plan asset (gain) loss	724	(192)	(64)
Amortization of net actuarial loss	(1,533)	(2,308)	(1,351)
Amortization of prior service cost	(61)	(62)	(58)
Other	124	0	4
Other comprehensive (income) loss	$ (3,939)	$ (5,183)	$ 3,504