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Equity: Performance Share Plan (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation expense $ 12.0    
Share-based Compensation Arrangement by Share-based Payment Award, Performance Shares, Outstanding [Roll Forward]      
Performance Goal - Percentile of Peer Group Performance 74.80%    
Weighted-average recognition period 1 year 11 months    
Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Share Award Payout, Cash Percentage 50.00%    
Performance Share Award Payout, Shares of Common Stock Percentage 50.00%    
The percentage paid in cash for the accrued equity portion of the performance share plan upon change in control 100.00%    
Unrecognized compensation expense $ 2.8    
Performance Share Award, Percentage of Target 161.90%    
Share-based Compensation Arrangement by Share-based Payment Award, Performance Shares, Outstanding [Roll Forward]      
Performance Shares, Number of Shares Authorized, Beginning of Period 49 51  
Performance Shares, Number of Shares Authorized, End of Period 53 49 51
Share-based Compensation Arrangement by Share-based Payment Award, Performance Shares, Outstanding [Roll Forward]      
Granted (usd per share) $ 61.82    
Blended volatility 21.00% 23.00% 24.00%
Historical volatility 50.00%    
Weighted Average Grant Date Fair Value (usd per share)   $ 63.52 $ 47.76
Target shares, value $ 5.7    
Unrecognized compensation expense $ 3.2    
Weighted-average recognition period 1 year 9 months    
Performance Shares, Liability Awards      
Share-based Compensation Arrangement by Share-based Payment Award, Performance Shares, Outstanding [Roll Forward]      
Performance Shares, Number of Shares Authorized, Beginning of Period 74    
Performance Shares, Granted in Period 28    
Performance Shares, Forfeited in Period (3)    
Performance Shares, Vested in Period (22)    
Performance Shares, Number of Shares Authorized, End of Period 77 74  
Share-based Compensation Arrangement by Share-based Payment Award, Performance Shares, Outstanding [Roll Forward]      
Balance at end of period (usd per share) $ 76.03    
Performance Shares, Equity Awards      
Share-based Compensation Arrangement by Share-based Payment Award, Performance Shares, Outstanding [Roll Forward]      
Performance Shares, Number of Shares Authorized, Beginning of Period 74    
Performance Shares, Granted in Period 28    
Performance Shares, Forfeited in Period (3)    
Performance Shares, Vested in Period (22)    
Performance Shares, Number of Shares Authorized, End of Period 77 74  
Share-based Compensation Arrangement by Share-based Payment Award, Performance Shares, Outstanding [Roll Forward]      
Balance at beginning of period (usd per share) $ 55.31    
Forfeited (usd per share) 58.14    
Vested (usd per share) 54.92    
Balance at end of period (usd per share) $ 57.66 $ 55.31  
Minimum | Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Share Award, Percentage of Target 0.00% 0.00% 0.00%
Maximum | Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Share Award, Percentage of Target 200.00% 200.00% 200.00%