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Earnings per Share/Capital Stock: (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Anti-dilutive stock options not included in the computation of diluted EPS (in shares)	0						0	0
Payments Related to Tax Withholding for Share-based Compensation							$ 1,581	$ 1,217
Basic
Net income	$ 28,006	$ 26,784	$ 12,852	$ 22,952	$ 16,348	$ 10,782	$ 67,642	$ 50,082
Dividends Declared Per Common Share (in dollars per share)	$ 0.305			$ 0.275			$ 0.855	$ 0.785
Weighted Average Dividends Common Stock	$ 11,234			$ 10,102			$ 31,466	$ 28,831
Less: Distributed earnings to participating securities	50			54			137	151
Undistributed earnings	16,722			12,796			36,039	21,100
Undistributed earnings allocated to common shareholders	16,647			12,727			35,882	20,991
Undistributed earnings allocated to participating securities	75			69			157	109
Total income available to common shareholders, basic	$ 27,881			$ 22,829			$ 67,348	$ 49,822
Weighted average Common Shares outstanding, basic (in shares)	36,835,000			36,737,000			36,804,000	36,728,000
Basic earnings per Common Share (in dollars per share)	$ 0.76			$ 0.62			$ 1.83	$ 1.36
Diluted
Total income available to common shareholders, basic	$ 27,881			$ 22,829			$ 67,348	$ 49,822
Undistributed earnings for dilutive stock-based awards	75			69			157	109
Total common shareholders earnings, diluted	$ 27,956			$ 22,898			$ 67,505	$ 49,931
Weighted average Common Shares outstanding, basic (in shares)	36,835,000			36,737,000			36,804,000	36,728,000
Stock-based compensation (in shares)	161,000			213,000			156,000	207,000
Weighted average common shares outstanding, diluted (in shares)	36,996,000			36,950,000			36,960,000	36,935,000
Diluted earnings per Common Share (in dollars per share)	$ 0.76			$ 0.62			$ 1.83	$ 1.35

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