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Revenue Recognition - Impact of Adoption of Revenue Recognition Standard (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Assets [Abstract] |  |
Contracts in progress | $ 449,176 | $ 376,037
Deferred Income Taxes | 49,415 | 58,689
Liabilities [Abstract] |  |
Accrued liabilities – other | 78,028 | 52,213
Advance billings on contracts | 83,581 | 75,425
Equity [Abstract] |  |
Retained earnings | $ 1,549,950 | $ 1,344,383

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