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Earnings per Share/Capital Stock: (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Basic
Net income		$ 22,952	$ 21,006	$ 50,082	$ 56,499
Less: (a) Distributed earnings to common shareholders		10,102	9,349	28,831	27,064
Less: Distributed earnings to participating securities		54	50	151	139
Undistributed earnings		12,796	11,607	21,100	29,296
(b) Undistributed earnings allocated to common shareholders		12,727	11,546	20,991	29,147
Undistributed earnings allocated to participating securities		69	61	109	149
Common shareholders earnings, basic		$ 22,829	$ 20,895	$ 49,822	$ 56,211
Weighted average Common Shares outstanding, basic		36,737	36,659	36,728	36,625
Basic earnings per Common Share (in dollars per share)		$ 0.62	$ 0.57	$ 1.36	$ 1.53
Diluted
Common shareholders earnings, basic		$ 22,829	$ 20,895	$ 49,822	$ 56,211
Undistributed earnings for dilutive stock-based awards		69	61	109	149
Total common shareholders earnings, diluted		$ 22,898	$ 20,956	$ 49,931	$ 56,360
Weighted average Common Shares outstanding, basic		36,737	36,659	36,728	36,625
Stock-based compensation (in shares)	[1]	213	197	207	188
Weighted average common shares outstanding, diluted		36,950	36,856	36,935	36,813
Diluted earnings per Common Share (in dollars per share)		$ 0.62	$ 0.57	$ 1.35	$ 1.53
[1] In applying the treasury stock method of reflecting the dilutive effect of outstanding stock-based compensation in the calculation of diluted EPS, 47,792 and 70,702 stock options at September 30, 2018 and 2017, respectively, were deemed to be outstanding in accordance with the accounting guidance on earnings per share. All of the 198,613 and 195,457 restricted stock units at September 30, 2018 and 2017, respectively, were included in the calculation of diluted EPS for the three and nine months ended September 30, 2018 and 2017.

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