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Earnings per Share/Capital Stock: (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 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					$ 1,573	$ 1,214
Basic
Net income	$ 26,784	$ 12,852	$ 16,348	$ 10,782	$ 39,636	$ 27,130
Dividends Declared Per Common Share (in dollars per share)	$ 0.275		$ 0.255		$ 0.550	$ 0.510
Weighted Average Dividends Common Stock	$ 10,119		$ 9,367		$ 20,232	$ 18,729
Less: Distributed earnings to participating securities	46		51		88	96
Undistributed earnings	16,619		6,930		19,316	8,305
Undistributed earnings allocated to common shareholders	16,543		6,894		19,232	8,263
Undistributed earnings allocated to participating securities	76		36		84	42
Total income available to common shareholders, basic	$ 26,662		$ 16,261		$ 39,464	$ 26,992
Weighted average Common Shares outstanding, basic (in shares)	36,804,000		36,733,000		36,788,000	36,723,000
Basic earnings per Common Share (in dollars per share)	$ 0.72		$ 0.44		$ 1.07	$ 0.74
Diluted
Total income available to common shareholders, basic	$ 26,662		$ 16,261		$ 39,464	$ 26,992
Undistributed earnings for dilutive stock-based awards	75		36		84	42
Total common shareholders earnings, diluted	$ 26,737		$ 16,297		$ 39,548	$ 27,034
Weighted average Common Shares outstanding, basic (in shares)	36,804,000		36,733,000		36,788,000	36,723,000
Stock-based compensation (in shares)	159,000		179,000		154,000	173,000
Weighted average common shares outstanding, diluted (in shares)	36,963,000		36,912,000		36,942,000	36,896,000
Diluted earnings per Common Share (in dollars per share)	$ 0.72		$ 0.44		$ 1.07	$ 0.73

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