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Stock-Based Compensation - Restricted Stock and RSUs to be Settled in Common Stock (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Non-cash stock compensation expense | $ 91,641 | $ 52,013 | $ 52,484
Restricted Stock Units to be Settled in Common Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares granted (in shares) | 2,029 | 2,100 | 1,600
Weighted average grant date fair value (in dollars per share) | $ 39.91 | $ 35.62 | $ 34.37
Award vesting period | 3 years |  |
Awards vested (in shares) | 1,269 | 1,300 | 1,400
Fair value of vested restricted stock | $ 51,600 | $ 48,700 | $ 48,600
Non-cash stock compensation expense | 55,700 | $ 45,500 | $ 43,900
Unrecognized compensation cost, related to unvested restricted stock, total | $ 80,900 |  |
Expected weighted average period to recognize compensation cost on RSUs to be settled in common stock (in years) | 2 years 4 months 17 days |  |
PSUs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares granted (in shares) | 400 | 400 | 300
Weighted average grant date fair value (in dollars per share) | $ 34.60 | $ 40.15 | $ 38.28
Awards vested (in shares) | 200 | 200 | 100
Non-cash stock compensation expense | $ 35,900 | $ 6,500 | $ 8,600
Charge to correct valuation correction | $ 14,000 | $ 7,200 | $ 5,700

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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