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Schedule II Condensed Financial Information of Registrant - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 47,791 | $ 36,474 | $ 30,578 | $ 18,472 | $ 33,001 | $ 25,454 | $ 93,822 | $ 32,166 | $ (20,257) | $ 12,528 | $ 5,917 | $ 20,155 |  | $ 133,315 | $ 184,443 | $ 18,343
Changes in: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other operating assets and liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  | (4,539) | 53,406 | (2,048)
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |  |  |  | 259,794 | 127,573 | 200,888
Cash flows from investing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of equity securities |  |  |  |  |  |  |  |  |  |  |  |  |  | (37,353) | (15,583) | (13,430)
Change in short-term and other investments, net |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,061 | (49,325) | (56,192)
Acquisition of businesses |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (421,516) | 0
Net cash (used in) provided by investing activities |  |  |  |  |  |  |  |  |  |  |  |  |  | (406,757) | 55,942 | (186,499)
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid to shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  | (49,620) | (47,333) | (46,689)
Principal borrowings on Bank Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000 |  |  |
Proceeds from exercise of stock options |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,402 | 1,730 | 3,627
Withholding tax payments on RSUs tendered |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,299) | (3,680) | (3,165)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  |  |  |  |  |  | 143,778 | (169,913) | (10,110)
Cash at beginning of period |  |  |  | 25,206 |  |  |  | 11,906 |  |  |  |  |  | 25,206 | 11,906 |
Cash at end of period | 21,774 |  |  |  | 25,206 |  |  |  | 11,906 |  |  |  |  | 21,774 | 25,206 | 11,906
Parent company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  | 133,315 | 184,443 | 18,343
Equity in net earnings of subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  | (148,703) | (205,453) | (36,310)
Dividends received from subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  | 167,000 | 363,250 | 61,000
Changes in: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,956 | 3,369 | (4,939)
Other operating assets and liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  | (5,894) | 8,310 | (1,792)
Other |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,681 | 686 | 13,804
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |  |  |  | 149,355 | 354,605 | 50,106
Cash flows from investing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of equity securities |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000 | 0 | 0
Change in short-term and other investments, net |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,456) | 3,336 | 1,621
Capital contributions to subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  | (97,000) | 0 | 0
Acquisition of businesses |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (444,124) | 0
Net cash (used in) provided by investing activities |  |  |  |  |  |  |  |  |  |  |  |  |  | (97,456) | (440,788) | 1,621
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid to shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  | (49,620) | (47,333) | (46,689)
Principal borrowings on Bank Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 135,000 | 0
Acquisition of treasury stock |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,145) | 0 | (5,088)
Proceeds from exercise of stock options |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,402 | 1,730 | 3,627
Withholding tax payments on RSUs tendered |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,299) | (3,680) | (3,165)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  |  |  |  |  |  | (51,662) | 85,717 | (51,315)
Net increase (decrease) in cash |  |  |  |  |  |  |  |  |  |  |  |  |  | 237 | (466) | 412
Cash at beginning of period |  |  |  | $ 72 |  |  |  | $ 538 |  |  |  | $ 126 |  | 72 | 538 | 126
Cash at end of period | $ 309 |  |  |  | $ 72 |  |  |  | $ 538 |  |  |  | $ 126 | $ 309 | $ 72 | $ 538

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