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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT 3 (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Condensed financial statements      
Net Cash Provided by (Used in) Operating Activities $ 122,170 $ 116,864 $ 136,774
Cash Flows From Investing Activities:      
Net Cash Provided by (Used in) Investing Activities (131,610) (153,195) (128,042)
Cash Flows From Financing Activities:      
Proceeds from stock option exercises 30 519 546
Dividends paid (47,206) (42,702) (38,937)
Net Cash Provided by (Used in) Financing Activities 44,843 30,524 (1,805)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect 35,403 (5,807) 6,927
Cash and cash equivalents, beginning of period 1,334 7,141 214
Cash and cash equivalents, end of year 36,737 1,334 7,141
Parent Company      
Condensed financial statements      
Net Cash Provided by (Used in) Operating Activities 47,307 40,459 79,877
Cash Flows From Investing Activities:      
Loans (made to)/repaid from, wholly-owned subsidiaries 151,000 (107,500) (30,500)
Investment Company, Net Assets, Period Increase (Decrease) (60,000) 0 (47,500)
Net Cash Provided by (Used in) Investing Activities 91,000 (107,500) (78,000)
Cash Flows From Financing Activities:      
Proceeds from stock option exercises 30 519 546
Net change in notes payable to banks 91,000 (109,500) (36,500)
Repayments of Related Party Debt (6,000) 0 0
Proceeds from Related Party Debt 6,000 0 0
Dividends paid (47,206) (42,702) (38,937)
Net Cash Provided by (Used in) Financing Activities (138,176) 67,317 (1,891)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect 131 276 (14)
Cash and cash equivalents, beginning of period 310 34 48
Cash and cash equivalents, end of year $ 441 $ 310 $ 34