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Stock Based Compensation - Summary of Non-Cash Stock-Based Compensation Expense (Details) - USD ($) $ 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-based compensation | $ 59,749 | $ 46,994 | $ 33,519
Employee Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Non-cash stock-based compensation | 8,789 | 6,504 | 4,744
2010 SIP and 2019 SIP |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Non-cash stock-based compensation | 50,198 | 39,626 | 28,027
Performance Stock Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Non-cash stock-based compensation | $ 762 | $ 864 | $ 748

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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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