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Revenue Recognition - Impact of Adoption of Revenue Recognition Standard (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
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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