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Fair Value Measurements (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Assets: |  |  |
Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities | $ 0 | $ 0 |
Held-to-maturity Securities, Unrecognized Holding Gain | 0 | 0 |
Held-to-maturity Securities, Unrecognized Holding Loss | 0 | 0 |
Held-to-maturity Securities, Transferred Security, at Carrying Value | 0 | 0 |
Foreign Currency Forward Contract | 100,000 |  |
Liabilities: |  |  |
Long-term Debt | 406,398 | 515,931 |
Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Assets held in rabbi trusts | 57,892 | 52,148 |
Available for sale securities | 4,917 | 4,405 |
Fair Value Assets | 137,143 | 130,182 |
Defined Benefit Pension Plans [Member] | Foreign Plan [Member] |  |  |
Assets: |  |  |
Fair value of plan assets | 74,334 | 73,629 | $ 70,820
Defined Benefit Pension Plans [Member] | Foreign Plan [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Fair value of plan assets | 9,446 | 10,534 |
Defined Benefit Pension Plans [Member] | Foreign Plan [Member] | Fixed Income Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Fair value of plan assets | 18,105 | 16,381 |
Defined Benefit Pension Plans [Member] | Foreign Plan [Member] | Cash and Cash Equivalents [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Fair value of plan assets | 46,783 | 46,714 |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Assets held in rabbi trusts | 34,145 | 34,280 |
Available for sale securities | 4,917 | 4,405 |
Fair Value Assets | 113,396 | 112,314 |
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Pension Plans [Member] | Foreign Plan [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Fair value of plan assets | 9,446 | 10,534 |
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Pension Plans [Member] | Foreign Plan [Member] | Fixed Income Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Fair value of plan assets | 18,105 | 16,381 |
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Pension Plans [Member] | Foreign Plan [Member] | Cash and Cash Equivalents [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Fair value of plan assets | 46,783 | 46,714 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Liabilities: |  |  |
Long-term Debt, Fair Value | 491,400 | 632,200 |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Assets held in rabbi trusts | 23,747 | 17,868 |
Available for sale securities | 0 | 0 |
Fair Value Assets | 23,747 | 17,868 |
Fair Value, Inputs, Level 2 [Member] | Defined Benefit Pension Plans [Member] | Foreign Plan [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Defined Benefit Pension Plans [Member] | Foreign Plan [Member] | Fixed Income Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Defined Benefit Pension Plans [Member] | Foreign Plan [Member] | Cash and Cash Equivalents [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Assets held in rabbi trusts | 0 | 0 |
Available for sale securities | 0 | 0 |
Fair Value Assets | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Defined Benefit Pension Plans [Member] | Foreign Plan [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Defined Benefit Pension Plans [Member] | Foreign Plan [Member] | Fixed Income Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Fair value of plan assets | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Defined Benefit Pension Plans [Member] | Foreign Plan [Member] | Cash and Cash Equivalents [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Fair value of plan assets | $ 0 | $ 0 |

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