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v3.20.4

Significant Accounting Policies - Recently Adopted Accounting Standards (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2019 | Jan. 01, 2018
--- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Stockholders' equity | $ 2,540,203 | $ 2,263,229 |  |
Other current assets | (48,324) | (37,211) |  |
Deferred income taxes | (163,863) | (146,574) |  |
Retained earnings | (2,841,546) | (2,615,131) |  |
Operating lease, right-of-use asset | 106,586 | 82,374 |  |
Present value of lease liabilities | $ 110,971 | $ 85,163 |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Other current assets |  |  |  | $ 7,300
Deferred income taxes |  |  |  | 6,700
Retained earnings |  |  |  | 600
Operating lease, right-of-use asset |  |  | $ 68,000 |
Present value of lease liabilities |  |  | 68,000 |
Finance lease, liability |  |  | 68,000 |
Finance lease, right-of-use asset |  |  | $ 68,000 |
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Stockholders' equity |  |  |  | 6,400
Cumulative Effect, Period of Adoption, Adjustment | AOCI Attributable to Parent |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Stockholders' equity |  |  |  | $ 6,400

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