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Condensed Financial Statements of Parent Company - Condensed Statements of Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income:      
Income before provision for (benefit of) income taxes $ 604,279 $ 103,972 $ 230,425
Applicable income tax benefit (128,736) 16,660 (43,942)
Net income 475,543 120,632 186,483
Parent company | Reportable Legal Entities      
Income:      
Dividends from subsidiaries 200,083 90,404 214,852
Operating income 25 52 5,386
Total income 200,108 90,456 220,238
Operating expenses 40,727 45,574 15,409
Income before provision for (benefit of) income taxes 159,381 44,882 204,829
Applicable income tax benefit 9,053 8,960 1,883
Equity in undistributed earnings of subsidiaries (excess distribution) 307,109 66,790 (20,229)
Net income $ 475,543 $ 120,632 $ 186,483