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Fair Value and Equity Investments, Fair Value (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Contingent Consideration [Member] |  |
Changes in Fair Value of Level 3 Contingent Consideration [Roll Forward] |  |
Beginning balance | $ (3,125) | $ 0
Additions from acquisitions | (8,702) | (3,125)
Changes in fair value of contingent consideration | 1,486 | 0
Ending balance | (10,341) | (3,125)
Fair Value on a Recurring Basis [Member] |  |
Financial Assets (Liabilities) [Abstract] |  |
Cash equivalents and current investments | 66,477 | 56,628
Derivative financial instruments asset | 6,590 | 1,145
Life insurance contracts | 49,851 | 45,453
Derivative financial instruments liability |  | (105)
Contingent consideration | (10,341) | (3,125)
Financial assets (liabilities) | 112,577 | 99,996
Restricted current investments | 5,200 | 21,200
Fair Value on a Recurring Basis [Member] | Level 1 [Member] |  |
Financial Assets (Liabilities) [Abstract] |  |
Cash equivalents and current investments | 66,477 | 56,628
Derivative financial instruments asset | 0 | 0
Life insurance contracts | 0 | 0
Derivative financial instruments liability |  | 0
Contingent consideration | 0 | 0
Financial assets (liabilities) | 66,477 | 56,628
Fair Value on a Recurring Basis [Member] | Level 2 [Member] |  |
Financial Assets (Liabilities) [Abstract] |  |
Cash equivalents and current investments | 0 | 0
Derivative financial instruments asset | 6,590 | 1,145
Life insurance contracts | 0 | 0
Derivative financial instruments liability |  | (105)
Contingent consideration | 0 | 0
Financial assets (liabilities) | 6,590 | 1,040
Fair Value on a Recurring Basis [Member] | Level 3 [Member] |  |
Financial Assets (Liabilities) [Abstract] |  |
Cash equivalents and current investments | 0 | 0
Derivative financial instruments asset | 0 | 0
Life insurance contracts | 49,851 | 45,453
Derivative financial instruments liability |  | 0
Contingent consideration | (10,341) | (3,125)
Financial assets (liabilities) | 39,510 | 42,328
Life Insurance Contracts [Member] |  |
Changes in Fair Value of Level 3 Marketable Securities [Roll Forward] |  |
Beginning balance | 45,453 | 41,707
Actual return on plan assets | 5,153 | 3,746
Purchases and issuances | 6,261 | 0
Sales and settlements | (7,016) | 0
Transfers into Level 3 | 0 | 0
Ending balance | $ 49,851 | $ 45,453

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