Employee Benefit Plans - Pension Plan Asset Allocation (Details) - USD ($) $ in Thousands		Dec. 31, 2019		Dec. 31, 2018	Dec. 31, 2017
Asset Category
Fair Value of Plan Assets (in dollars)		$ 92,290	[1]	$ 76,210	$ 66,159
Percentage of Plan Assets		100.00%		100.00%
Equity securities
Asset Category
Fair Value of Plan Assets (in dollars)	[1]	$ 54,800
Percentage of Plan Assets		59.00%		61.00%
Fixed income
Asset Category
Fair Value of Plan Assets (in dollars)	[1]	$ 33,976
Percentage of Plan Assets		37.00%		37.00%
Cash equivalents
Asset Category
Fair Value of Plan Assets (in dollars)	[1]	$ 3,514
Percentage of Plan Assets		4.00%		2.00%
Minimum | Equity securities
Asset Category
Target plan asset allocations		50.00%
Minimum | Fixed income
Asset Category
Target plan asset allocations		25.00%
Minimum | Cash equivalents
Asset Category
Target plan asset allocations		0.00%
Maximum | Equity securities
Asset Category
Target plan asset allocations		65.00%
Maximum | Fixed income
Asset Category
Target plan asset allocations		55.00%
Maximum | Cash equivalents
Asset Category
Target plan asset allocations		10.00%

[1] Additional information regarding the fair value of Pension Plan assets as of December 31, 2019 can be found in Note 22, "Fair Value."