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Earnings per Share/Capital Stock: (Details 2) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Additional disclosure        
Options outstanding (in shares) 91,634 142,402 91,634 142,402
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     73,398 52,212
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans     $ 524 $ 126
Weighted Average Dividends Common Stock $ 8,861 $ 8,188 17,715 16,369
Dividends paid     $ 17,715 $ 16,369
Quarterly dividends paid, per share of common stock (in dollars per share) $ 0.242 $ 0.2240 $ 0.484 $ 0.4480
Restricted Stock Units        
Additional disclosure        
Restricted stock units outstanding (in shares) 208,059 227,364 208,059 227,364