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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT 2 (Details) - USD ($) $ / shares in Units, shares in Thousands | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
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, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2020 | Jun. 30, 2020 | Feb. 11, 2020
Condensed financial statements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 225,000,000.0 |  |  |  |  |  |  |  | $ 225,000,000.0 |  |  |  |  |
Income tax expense |  |  |  |  |  |  |  |  | 24,670,000 | $ 18,017,000 | $ 38,974,000 |  |  |
Net Income | $ 16,700,000 | $ 28,006,000 | $ 26,784,000 | $ 12,852,000 | $ 13,789,000 | $ 22,952,000 | $ 16,348,000 | $ 10,782,000 | $ 84,342,000 | $ 63,871,000 | $ 69,367,000 |  |  |
Weighted Average Number of Shares Outstanding (in shares) |  |  |  |  |  |  |  |  | 36,814 | 36,733 | 36,638 |  |  |
Earnings Per Share, Basic | $ 0.45 | $ 0.76 | $ 0.72 | $ 0.35 | $ 0.37 | $ 0.62 | $ 0.44 | $ 0.29 | $ 2.28 | $ 1.73 | $ 1.88 |  |  |
Weighted Average Number of Diluted Common Shares Outstanding |  |  |  |  |  |  |  |  | 36,964 | 36,936 | 36,844 |  |  |
Earnings Per Share, Diluted | $ 0.45 | $ 0.76 | $ 0.72 | $ 0.35 | $ 0.37 | $ 0.62 | $ 0.44 | $ 0.29 | $ 2.28 | $ 1.72 | $ 1.88 |  |  |
Dividends Declared Per Common Share (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.160 | $ 1.060 | $ 0.994 |  |  |
Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed financial statements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 225,000,000.0 |  |  |  |  |  |  |  | $ 225,000,000.0 |  |  |  |  |
Operating revenues and other income |  |  |  |  |  |  |  |  | 0 | $ 0 | $ 0 |  |  |
Operating Expenses and Other Expenses |  |  |  |  |  |  |  |  | 314,000 | 305,000 | 344,000 |  |  |
Operating income / (loss) |  |  |  |  |  |  |  |  | (314,000) | (305,000) | (344,000) |  |  |
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 83,947,000 | 63,651,000 | 67,490,000 |  |  |
Closed Block Operations, Results before Income Taxes |  |  |  |  |  |  |  |  | 83,633,000 | 63,346,000 | 67,146,000 |  |  |
Income tax expense |  |  |  |  |  |  |  |  | (709,000) | (525,000) | (2,221,000) |  |  |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | (525,000) | (2,221,000) |  |  |
Net Income |  |  |  |  |  |  |  |  | $ 84,342,000 | $ 63,871,000 | $ 69,367,000 |  |  |
Earnings Per Share, Basic |  |  |  |  |  |  |  |  | $ 2.28 | $ 1.73 | $ 1.88 |  |  |
Earnings Per Share, Diluted |  |  |  |  |  |  |  |  | 2.28 | 1.72 | 1.88 |  |  |
Dividends Declared Per Common Share (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.160 | $ 1.060 | $ 0.994 |  |  |
Subsequent Event [Member] | Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed financial statements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000.0 | $ 200,000,000.0 | $ 260,000,000.0

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