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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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Additional disclosure
Options outstanding (in shares)	70,702	138,060	70,702	138,060
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			107,815	67,832
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans			$ 884	$ 210
Weighted Average Dividends Common Stock	$ 9,349	$ 8,189	27,064	24,558
Dividends paid			$ 27,064	$ 24,558
Quarterly dividends paid, per share of common stock (in dollars per share)	$ 0.255	$ 0.224	$ 0.739	$ 0.672
Restricted Stock Units
Additional disclosure
Restricted stock units outstanding (in shares)	195,457	216,733	195,457	216,733

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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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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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