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Share and Unit-Based Plans: Stock Awards and Stock Units Roll Forward Activity (Details)
 12 Months Ended
Dec. 31, 2015
$ / shares
shares
Dec. 31, 2014
$ / shares
shares
Dec. 31, 2013
$ / shares
shares
Stock awards      
Shares or Units      
Balance at beginning of year | shares 9,189 19,001 20,924
Granted | shares 0 0 8,963
Vested | shares (7,577) (9,812) (10,886)
Balance at end of year | shares 1,612 9,189 19,001
Weighted Average Grant Date Fair Value (in dollars per share)      
Balance at beginning of year | $ / shares $ 59.25 $ 56.77 $ 49.36
Granted | $ / shares 0.00 0.00 61.84
Vested | $ / shares 58.67 54.45 46.70
Balance at end of year | $ / shares $ 62.01 $ 59.25 $ 56.77
Stock units      
Shares or Units      
Balance at beginning of year | shares 144,374 137,318 114,677
Granted | shares 77,282 75,309 67,920
Vested | shares (86,761) (68,253) (45,279)
Forfeited | shares (2,809) 0 0
Balance at end of year | shares 132,086 144,374 137,318
Number of common shares into which units can be converted (in shares) 1    
Weighted Average Grant Date Fair Value (in dollars per share)      
Balance at beginning of year | $ / shares $ 59.94 $ 57.24 $ 52.19
Granted | $ / shares 86.53 60.50 62.01
Vested | $ / shares 61.29 55.14 51.59
Forfeited | $ / shares 86.72 0.00 0.00
Balance at end of year | $ / shares $ 74.58 $ 59.94 $ 57.24