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Earnings per Share/Capital Stock: (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Basic
Net income	$ 10,782	$ 12,701
Dividends Declared Per Common Share (in dollars per share)	$ 0.255	$ 0.242
Weighted Average Dividends Common Stock	$ 9,362	$ 8,854
Less: Distributed earnings to participating securities	46	42
Undistributed earnings	1,374	3,805
Undistributed earnings allocated to common shareholders	1,367	3,787
Undistributed earnings allocated to participating securities	7	18
Total income available to common shareholders, basic	$ 10,729	$ 12,641
Weighted average Common Shares outstanding, basic (in shares)	36,712	36,590
Basic earnings per Common Share (in dollars per share)	$ 0.29	$ 0.35
Diluted
Total income available to common shareholders, basic	$ 10,729	$ 12,641
Undistributed earnings for dilutive stock-based awards	8	18
Total common shareholders earnings, diluted	$ 10,737	$ 12,659
Weighted average Common Shares outstanding, basic (in shares)	36,712	36,590
Stock-based compensation (in shares)	162	192
Weighted average common shares outstanding, diluted (in shares)	36,874	36,782
Diluted earnings per Common Share (in dollars per share)	$ 0.29	$ 0.34

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