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Basis Of Presentation And New Accounting Standards - New Accounting Standards (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Long-term debt | $ 265,222 | $ 258,912
Common stock | 1,288,603 | 1,327,592
Retained earnings | 456,108 | 464,524
Deferred tax liabilities | $ 97,906 | 110,821
Cumulative-effect adjustments upon adoption of ASU | Accounting Standards Update 2020-06 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Long-term debt |  | 44,100
Common stock |  | (41,500)
Retained earnings |  | 6,700
Deferred tax liabilities |  | $ (9,300)

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