Employee Benefit Plans - Major Categories of Assets in Pension Plan (Details) - DB Pension Plans - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value of Plan Assets	$ 82,352	$ 72,474	$ 80,154
(Level 1)
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value of Plan Assets	82,352	72,474
(Level 2)
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value of Plan Assets	0	0
(Level 3)
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value of Plan Assets	0	0
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value of Plan Assets	1,367	1,018
Cash and cash equivalents \| (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value of Plan Assets	1,367	1,018
Cash and cash equivalents \| (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value of Plan Assets	0	0
Cash and cash equivalents \| (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value of Plan Assets	0	0
Common stocks
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value of Plan Assets	26,574	20,648
Common stocks \| (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value of Plan Assets	26,574	20,648
Common stocks \| (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value of Plan Assets	0	0
Common stocks \| (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value of Plan Assets	0	0
Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value of Plan Assets	54,411	50,808
Mutual funds \| (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value of Plan Assets	54,411	50,808
Mutual funds \| (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value of Plan Assets	0	0
Mutual funds \| (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value of Plan Assets	$ 0	$ 0