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Equity: Restricted Stock (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value      
Unrecognized compensation expense $ 12,000    
Weighted-average recognition period 1 year 11 months    
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested Number of Shares [Roll Forward]      
Restricted Stock balance at beginning of period 267    
Shares Granted 113    
Shares Vested (119)    
Shares Forfeited (25)    
Restricted Stock at end of period 236 267  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value      
Balance at beginning of period (usd per share) $ 55.94    
Granted (usd per share) 57.31 $ 60.63 $ 53.55
Vested (usd per share) 54.24    
Forfeited (usd per share) 55.52    
Balance at end of period (usd per share) $ 57.50 $ 55.94  
Restricted Stock and RSUs, total fair value of shares vested $ 6,776 $ 7,909 $ 4,602
Unrecognized compensation expense $ 8,900    
Weighted-average recognition period 2 years 1 month