Employee Benefit Plans - Other Plan Changes Recognized in Other Comprehensive (Income) Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Net actuarial (gain) loss	$ (166)	$ (538)	$ 1,728
Amortization of prior service cost	0	0	0
Total recognized in other comprehensive (income) loss	(166)	(538)	1,728
Total Recognized in Net Periodic Benefit Cost and Other Comprehensive (Income) Loss	$ 262	$ 264	$ 1,636