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Share and Unit-Based Plans: Stock Option Activity (Details) - $ / shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Options      
Special dividend adjustment   0 0
Weighted Average Exercise Price (in dollars per share)      
Special dividend adjustment   $ 0.00 $ 0.00
Stock options      
Options      
Balance at beginning of year 10,068 10,068 12,768
Granted 0 0 0
Exercised 0 0 (2,700)
Special dividend adjustment 246    
Balance at end of year 10,314 10,068 10,068
Weighted Average Exercise Price (in dollars per share)      
Balance at beginning of year $ 59.57 $ 59.57 $ 54.69
Granted 0.00 0.00 0.00
Exercised 0.00 0.00 36.51
Special dividend adjustment 58.15    
Balance at end of year $ 58.15 $ 59.57 $ 59.57