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Earnings per Share/Capital Stock: (Details 2) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Additional disclosure
Options outstanding (in shares)	47,792	70,702	47,792	70,702
Anti-dilutive stock options not included in the computation of diluted EPS (in shares)	0		0	0
Common Shares issued under DRP and the 2000 and 2008 Employee Plans			64,245	107,815
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans			$ 348	$ 884
Less: (a) Distributed earnings to common shareholders	$ 10,102	$ 9,349	28,831	27,064
Dividends paid			$ 28,831	$ 27,064
Quarterly dividends paid, per share of common stock (in dollars per share)	$ 0.275	$ 0.255	$ 0.785	$ 0.739
Restricted Stock Units
Additional disclosure
Restricted stock units outstanding (in shares)	198,613	195,457	198,613	195,457

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The aggregate cash, stock, and paid-in-kind dividends declared for common shareholders during the period calculated on a weighted average basis.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

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