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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. 07, 2017 | 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 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ 33,001 | $ 25,454 | $ 93,822 | $ 32,166 | $ (20,257) | $ 12,528 | $ 5,917 | $ 20,155 | $ 125,329 | $ 26,551 | $ 2,261 | $ 15,318 | $ 184,443 | $ 18,343 | $ 169,459
Changes in: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other operating assets and liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  | 53,406 | (2,048) | (1,692)
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |  |  |  | 127,573 | 200,888 | 256,586
Cash flows from investing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of businesses |  |  |  |  |  |  |  |  |  |  |  |  |  | (421,516) | 0 | 0
Net cash provided by (used in) investing activities |  |  |  |  |  |  |  |  |  |  |  |  |  | 55,942 | (186,499) | (228,664)
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid to shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  | (47,333) | (46,689) | (46,114)
Principal borrowings on senior revolving credit facility | $ 25,000 |  |  |  |  |  |  |  |  | 50,000 |  |  |  | 135,000 | 0 | 0
Proceeds from exercise of stock options |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,730 | 3,627 | 4,190
Withholding tax payments on RSUs tendered |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,680) | (3,165) | (3,245)
Net cash used in financing activities |  |  |  |  |  |  |  |  |  |  |  |  |  | (169,913) | (10,110) | (36,965)
Cash at beginning of period |  |  |  |  | 11,906 |  |  |  | 7,627 |  |  |  |  | 11,906 | 7,627 |
Cash at end of period |  | 25,206 |  |  |  | 11,906 |  |  |  | 7,627 |  |  |  | 25,206 | 11,906 | 7,627
Parent company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  | 184,443 | 18,343 | 169,459
Equity in net earnings of subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  | (205,453) | (36,310) | (179,694)
Dividends received from subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  | 363,250 | 61,000 | 56,900
Changes in: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,369 | (4,939) | (7,041)
Other operating assets and liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,310 | (1,792) | (260)
Other |  |  |  |  |  |  |  |  |  |  |  |  |  | 686 | 13,804 | 9,861
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |  |  |  | 354,605 | 50,106 | 49,225
Cash flows from investing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net increase (decrease) in short-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,336 | 1,621 | (2,338)
Acquisition of businesses |  |  |  |  |  |  |  |  |  |  |  |  |  | (444,124) | 0 | 0
Net cash provided by (used in) investing activities |  |  |  |  |  |  |  |  |  |  |  |  |  | (440,788) | 1,621 | (2,338)
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid to shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  | (47,333) | (46,689) | (46,114)
Principal borrowings on senior revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  | 135,000 | 0 | 0
Acquisition of treasury stock |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (5,088) | (1,660)
Proceeds from exercise of stock options |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,730 | 3,627 | 4,190
Withholding tax payments on RSUs tendered |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,680) | (3,165) | (3,245)
Net cash used in financing activities |  |  |  |  |  |  |  |  |  |  |  |  |  | 85,717 | (51,315) | (46,829)
Net increase (decrease) in cash |  |  |  |  |  |  |  |  |  |  |  |  |  | (466) | 412 | 58
Cash at beginning of period |  |  |  |  | $ 538 |  |  |  | $ 126 |  |  |  | $ 68 | 538 | 126 | 68
Cash at end of period |  | $ 72 |  |  |  | $ 538 |  |  |  | $ 126 |  |  |  | $ 72 | $ 538 | $ 126

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