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Basis of Presentation and Summary of Significant Accounting Policies - Impact of Topic 326 (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Accounts receivable, reserve for credit losses | $ 59,147 | $ 52,274 | $ 52,274 | $ 46,948 | $ 33,387
Deferred income taxes, net (within total assets) | 17,524 | 12,833 | 12,833 |  |
Deferred income taxes, net | 220,122 | 218,740 | 218,740 |  |
Retained earnings | 1,286,976 | 1,539,201 | 1,539,201 |  |
Non-controlling interest | $ 13,022 | 9,575 | 9,575 |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Accounts receivable, reserve for credit losses |  |  | 11,577 |  |
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Accounts receivable, reserve for credit losses |  | 11,577 |  |  |
Deferred income taxes, net (within total assets) |  | 570 |  |  |
Deferred income taxes, net |  | (2,230) |  |  |
Retained earnings |  | (8,587) |  |  |
Non-controlling interest |  | (190) |  |  |
As Reported |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Accounts receivable, reserve for credit losses |  | 63,851 | $ 63,851 |  |
Deferred income taxes, net (within total assets) |  | 13,403 |  |  |
Deferred income taxes, net |  | 216,510 |  |  |
Retained earnings |  | 1,530,614 |  |  |
Non-controlling interest |  | $ 9,385 |  |  |

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