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Employee Benefit Plans (Fair Value Measurement Levels For Qualified Plan Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Short-term investments, which approximates fair value	$ 2,540	$ 1,204
Total	374,585	349,867
Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Mutual funds, fair value	84,663	93,609
Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Mutual funds, fair value	287,382	255,054
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Short-term investments, which approximates fair value	2,540	1,204
Total	374,585	349,867
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Mutual funds, fair value	84,663	93,609
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Mutual funds, fair value	287,382	255,054
Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Short-term investments, which approximates fair value
Total
Significant Other Observable Inputs (Level 2) [Member] | Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Mutual funds, fair value
Significant Other Observable Inputs (Level 2) [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Mutual funds, fair value
Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Short-term investments, which approximates fair value
Total
Significant Unobservable Inputs (Level 3) [Member] | Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Mutual funds, fair value
Significant Unobservable Inputs (Level 3) [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Mutual funds, fair value

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Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

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-Name Accounting Standards Codification
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-SubTopic 210
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