Employee Benefit Plans - Summary of Components of Net Periodic Pension Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Interest cost			$ 625
Expected return on assets			550
Amortization of loss			465
Settlement charges			7,107
Net periodic pension cost			8,747
Other changes in plan assets and obligations recognized in other comprehensive income:
Gain			(5,392)
Total other comprehensive income	$ 0	$ 0	(5,392)
Total net periodic pension cost and other comprehensive income			$ 3,355