Employee Benefit Plans, Fair Values of Pension Plan Assets (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Fair Value of Pension Plan Assets [Abstract]
Period to keep distributions in immediately available funds		1 year
Defined Benefit Pension Plans Combined [Member]
Fair Value of Pension Plan Assets [Abstract]
Fair value of plan assets		$ 65,584	$ 56,315	$ 49,349
Defined Benefit Pension Plans Combined [Member] | Cash and Money Market Funds [Member]
Fair Value of Pension Plan Assets [Abstract]
Fair value of plan assets	[1]	671	624
Defined Benefit Pension Plans Combined [Member] | Equity Mutual Funds [Member]
Fair Value of Pension Plan Assets [Abstract]
Fair value of plan assets	[2]	43,178	35,707
Defined Benefit Pension Plans Combined [Member] | U.S. Treasury Obligations [Member]
Fair Value of Pension Plan Assets [Abstract]
Fair value of plan assets		621	631
Defined Benefit Pension Plans Combined [Member] | Corporate and Foreign Bonds [Member]
Fair Value of Pension Plan Assets [Abstract]
Fair value of plan assets	[3]	4,580	5,615
Defined Benefit Pension Plans Combined [Member] | Fixed Income Mutual Funds [Member]
Fair Value of Pension Plan Assets [Abstract]
Fair value of plan assets	[4]	16,534	13,738
Defined Benefit Pension Plans Combined [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value of Pension Plan Assets [Abstract]
Fair value of plan assets		60,383	50,069
Defined Benefit Pension Plans Combined [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Cash and Money Market Funds [Member]
Fair Value of Pension Plan Assets [Abstract]
Fair value of plan assets	[1]	671	624
Defined Benefit Pension Plans Combined [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Mutual Funds [Member]
Fair Value of Pension Plan Assets [Abstract]
Fair value of plan assets	[2]	43,178	35,707
Defined Benefit Pension Plans Combined [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Treasury Obligations [Member]
Fair Value of Pension Plan Assets [Abstract]
Fair value of plan assets		0	0
Defined Benefit Pension Plans Combined [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Corporate and Foreign Bonds [Member]
Fair Value of Pension Plan Assets [Abstract]
Fair value of plan assets	[3]	0	0
Defined Benefit Pension Plans Combined [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fixed Income Mutual Funds [Member]
Fair Value of Pension Plan Assets [Abstract]
Fair value of plan assets	[4]	16,534	13,738
Defined Benefit Pension Plans Combined [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value of Pension Plan Assets [Abstract]
Fair value of plan assets		5,201	6,246
Defined Benefit Pension Plans Combined [Member] | Significant Other Observable Inputs (Level 2) [Member] | Cash and Money Market Funds [Member]
Fair Value of Pension Plan Assets [Abstract]
Fair value of plan assets	[1]	0	0
Defined Benefit Pension Plans Combined [Member] | Significant Other Observable Inputs (Level 2) [Member] | Equity Mutual Funds [Member]
Fair Value of Pension Plan Assets [Abstract]
Fair value of plan assets	[2]	0	0
Defined Benefit Pension Plans Combined [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Treasury Obligations [Member]
Fair Value of Pension Plan Assets [Abstract]
Fair value of plan assets		621	631
Defined Benefit Pension Plans Combined [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate and Foreign Bonds [Member]
Fair Value of Pension Plan Assets [Abstract]
Fair value of plan assets	[3]	4,580	5,615
Defined Benefit Pension Plans Combined [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fixed Income Mutual Funds [Member]
Fair Value of Pension Plan Assets [Abstract]
Fair value of plan assets	[4]	$ 0	$ 0

[1] The portfolios are designed to keep up to one year of distributions in immediately available funds.

[2] This category currently includes a majority of investments in closed-end mutual funds as well as domestic equity mutual funds and international mutual funds which give the portfolio exposure to mid and large cap index funds as well as international diversified index funds.

[3] This category currently includes only U.S. corporate bonds and notes widely distributed among consumer discretionary, consumer staples, healthcare, information technology, energy, transportation, and financial services.

[4] This category includes fixed income investments in mutual funds which include government and corporate of both the U.S. and other countries.  The non-U.S. corporate and sovereign investments add further diversity to the fixed income portion of the portfolio.