Defined Benefit Pension Plans Schedule of Amounts Recognized in Other Comprehensive Income (loss), pre-tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Net actuarial (gain) loss	$ 6,316	$ (6,894)	$ 25,838
Settlement/ curtailment loss	(1,343)	(336)	(55)
Plan asset (gain) loss	(64)	343	129
Amortization of net actuarial gain (loss)	(1,351)	(1,979)	(572)
Amortization of prior service cost	(58)	(59)	(138)
Other	4	(46)	68
Other comprehensive (income) loss	$ 3,504	$ (8,971)	$ 25,270