Employer Sponsored Benefit Plans - Trust Assets at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	$ 43,938	$ 87,452
Measured at NAV	0	28,039
Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	16,729	13,941
Measured at NAV	0	0
International equities
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	10,903	9,547
Measured at NAV	0	0
Fixed income
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	3,724	38,704
Measured at NAV	0	27,727
U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	2,686	2,466
Measured at NAV	0	0
Corporate and foreign bonds
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	1,701	1,448
Measured at NAV	0	0
Real assets
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	3,010	2,808
Measured at NAV	0	0
Hedge fund of funds
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	4,009	4,441
Measured at NAV	0	312
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	1,176	14,097
Measured at NAV	0	0
Level 1
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	38,520	53,429
Level 1 | Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	16,729	13,941
Level 1 | International equities
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	10,903	9,547
Level 1 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	3,724	10,977
Level 1 | U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	0	0
Level 1 | Corporate and foreign bonds
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	0	0
Level 1 | Real assets
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	3,010	2,808
Level 1 | Hedge fund of funds
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	4,009	4,129
Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	145	12,027
Level 2
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	5,418	5,984
Level 2 | Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	0	0
Level 2 | International equities
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	0	0
Level 2 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	0	0
Level 2 | U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	2,686	2,466
Level 2 | Corporate and foreign bonds
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	1,701	1,448
Level 2 | Real assets
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	0	0
Level 2 | Hedge fund of funds
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	0	0
Level 2 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	1,031	2,070
Level 3
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	0	0
Level 3 | Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	0	0
Level 3 | International equities
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	0	0
Level 3 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	0	0
Level 3 | U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	0	0
Level 3 | Corporate and foreign bonds
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	0	0
Level 3 | Real assets
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	0	0
Level 3 | Hedge fund of funds
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	0	0
Level 3 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	$ 0	$ 0