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Parent Company Only Financial Statements - Condensed Statements of Cash Flows (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Cash flows from operating activities:      
Net Income (Loss) $ 142,048 $ 71,274 $ 93,606
Stock-based compensation expense 7,222 6,059 5,541
Net cash provided by operating activities 166,935 214,634 179,502
Cash flows from investing activities:      
Purchase of non-marketable securities (106,200) (37,300)  
Net cash used in investing activities (404,031) (752,137) (473,836)
Cash flows from financing activities:      
Proceeds from issuance of long-term debt     40,000
Payment of long-term debt issuance costs     (535)
Issuance of stock under purchase and equity compensation plans (1,534) (1,481) (2,267)
Proceeds from exercise of stock options 617 1,102 2,489
Payment of dividends (39,643) (30,447) (26,888)
Repurchase of shares     (36,400)
Net cash provided by (used in) financing activities 230,903 (114,198) 528,989
(Decrease) increase in cash, cash equivalents and restricted cash(1) (6,193) (651,701) 234,655
Cash, cash equivalents and restricted cash at beginning of the year(1) 198,519 850,220 615,565
Cash, cash equivalents and restricted cash at end of period(1) 192,326 198,519 850,220
Consolidated | Reportable Legal Entities [Member]      
Cash flows from operating activities:      
Net Income (Loss) 142,048 71,274 93,606
Equity in undistributed earnings of subsidiaries (92,990) (30,260) (37,866)
Stock-based compensation expense 7,222 6,059 5,541
Amortization 310 158 13
Other 15,833 (221) (4,391)
Net cash provided by operating activities 72,423 47,010 56,903
Cash flows from investing activities:      
Cash paid for acquisitions   (67,128)  
Purchase of non-marketable securities (1,773) (11,471) (23,025)
Net cash used in investing activities (1,773) (78,599) (23,025)
Cash flows from financing activities:      
Proceeds from issuance of long-term debt     40,000
Payment of long-term debt issuance costs     (535)
Issuance of stock under purchase and equity compensation plans (1,534) (1,481) (2,267)
Proceeds from exercise of stock options 617 1,102 2,489
Payment of dividends (39,644) (30,447) (26,888)
Repurchase of shares     (36,400)
Net cash provided by (used in) financing activities (40,561) (30,826) (23,601)
(Decrease) increase in cash, cash equivalents and restricted cash(1) 30,089 (62,415) 10,277
Cash, cash equivalents and restricted cash at beginning of the year(1) 49,264 111,679 101,402
Cash, cash equivalents and restricted cash at end of period(1) $ 79,353 $ 49,264 $ 111,679