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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT 2 (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Condensed financial statements |  |  |  |  |  |  |  |  |  |  |
Income before income tax expense |  |  |  |  |  |  |  |  | $ 81,888 | $ 108,341 | $ 94,478
Net Income | $ 13,789 | $ 22,952 | $ 16,348 | $ 10,782 | $ 12,868 | $ 21,006 | $ 22,792 | $ 12,701 | $ 63,871 | $ 69,367 | $ 59,743
Weighted Average Number of Shares Outstanding (in shares) |  |  |  |  |  |  |  |  | 36,733 | 36,638 | 36,552
Earnings Per Share, Basic | $ 0.37 | $ 0.62 | $ 0.44 | $ 0.29 | $ 0.35 | $ 0.57 | $ 0.62 | $ 0.35 | $ 1.73 | $ 1.88 | $ 1.63
Weighted Average Number of Diluted Common Shares Outstanding |  |  |  |  |  |  |  |  | 36,936 | 36,844 | 36,750
Earnings Per Share, Diluted | $ 0.37 | $ 0.62 | $ 0.44 | $ 0.29 | $ 0.35 | $ 0.57 | $ 0.62 | $ 0.34 | $ 1.72 | $ 1.88 | $ 1.62
Dividends Declared Per Common Share (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.06 | $ 0.994 | $ 0.914
Parent Company |  |  |  |  |  |  |  |  |  |  |
Condensed financial statements |  |  |  |  |  |  |  |  |  |  |
Operating revenues and other income |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 71
Operating Expenses and Other Expenses |  |  |  |  |  |  |  |  | 305 | 344 | 19
Operating income / (loss) |  |  |  |  |  |  |  |  | (305) | (344) | 52
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 63,651 | 67,490 | 59,145
Income before income tax expense |  |  |  |  |  |  |  |  | 63,346 | 67,146 | 59,197
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (525) | (2,221) | (546)
Net Income |  |  |  |  |  |  |  |  | $ 63,871 | $ 69,367 | $ 59,743
Earnings Per Share, Basic |  |  |  |  |  |  |  |  | $ 1.73 | $ 1.88 | $ 1.63
Earnings Per Share, Diluted |  |  |  |  |  |  |  |  | 1.72 | 1.88 | 1.62
Dividends Declared Per Common Share (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.060 | $ 0.994 | $ 0.914

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