Employee Benefit Plans (Details) - Pension Plan Asset Allocation - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016		Dec. 31, 2015	Dec. 31, 2014
Asset Category:
Fair Value of Plan Assets (in dollars)		$ 65,189	[1]	$ 64,903	$ 72,193
Percentage of Plan Assets		100.00%		100.00%
Equity securities
Asset Category:
Target Plan Asset Allocations, minimum		50.00%
Target Plan Asset Allocations, maximum		60.00%
Fair Value of Plan Assets (in dollars)	[1]	$ 38,910
Percentage of Plan Assets		60.00%		59.00%
Fixed income
Asset Category:
Target Plan Asset Allocations, minimum		30.00%
Target Plan Asset Allocations, maximum		48.00%
Fair Value of Plan Assets (in dollars)	[1]	$ 21,405
Percentage of Plan Assets		33.00%		35.00%
Cash equivalents
Asset Category:
Target Plan Asset Allocations, minimum		2.00%
Target Plan Asset Allocations, maximum		10.00%
Fair Value of Plan Assets (in dollars)	[1]	$ 4,874
Percentage of Plan Assets		7.00%		6.00%

[1] Additional information regarding the fair value of Pension Plan assets as of December 31, 2016 can be found in Note 22, "Fair Value."