Employee Benefit Plans - Summary of Information About Plan Assets And Obligations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Changes in plan assets and benefit obligations recognized in Other Comprehensive Income [Abstract]
Settlement charges	$ 4,500	$ 4,300
Defined Benefit Plans [Member]
Changes in plan assets and benefit obligations recognized in Other Comprehensive Income [Abstract]
Net actuarial loss	5,695	14,801
Amortization of net loss	(2,095)	(1,239)	$ (2,918)
Curtailments		(1,097)
Settlement charges	(3,345)	(2,021)	(2,302)
Total recognized in other comprehensive (loss) income	255	10,444
Net periodic benefit cost	5,364	3,806	4,466
Total recognized in net periodic benefit cost and other comprehensive loss	5,619	14,250
SERP [Member]
Changes in plan assets and benefit obligations recognized in Other Comprehensive Income [Abstract]
Net actuarial loss	566	6,650
Amortization of net loss	(2,354)	(2,188)	(2,844)
Curtailments		(53)
Settlement charges	(1,121)	(2,279)	(1,083)
Total recognized in other comprehensive (loss) income	(2,909)	2,130
Net periodic benefit cost	5,478	6,517	$ 5,564
Total recognized in net periodic benefit cost and other comprehensive loss	$ 2,569	$ 8,647