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Compensation Plans: Stock Based (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
shares
$ / shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares of common stock available for grant 5,900,000 5,900,000    
Impact outright issuance of one share has on number of available shares   1    
Director [Member]        
Director Shares        
Stock Issued During Period, Shares, Share-based Compensation, Gross   63,741 71,573 53,473
Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum impact of issuance of one performance share award on available shares under the equity incentive plan   2    
Multiplier applied to PSU awards at settlement 0 0 0 0.2
Award vesting period 3 years      
Stock-based compensation expense | $   $ 10.3 $ 9.7 $ 11.0
Unrecognized stock based compensation expense | $ $ 19.0 $ 19.0    
Multiplier assumed   1    
Fair value of PSUs/RSUs granted in period | $   $ 14.0 $ 15.5 $ 11.9
Performance Share Units Shares Settled Gross of Shares for Tax Withholdings [1]       44,870
Shares held for settlement of income and payroll tax obligations (in shares)       (14,809)
Shares Issued in Period   0 0 30,061
Fair value of PSUs/RSUs Vested in Period | $   $ 10.3 $ 8.1 $ 8.4
Weighted Average Grant Date Fair Value        
Non-vested at beginning of year (in shares) [2]   1,533,491 828,923 626,328
Granted (in shares) [2]   572,924 977,731 447,971
Vested (in shares) [2]   (233,102) (94,338) (130,353)
Forfeited (in shares) [2]   (162,054) (178,825) (115,023)
Non-vested at end of year (in shares) [2] 1,711,259 1,711,259 1,533,491 828,923
Non-vested outstanding at the beginning of the period (in dollars per share) | $ / shares   $ 22.97 $ 43.25 $ 61.81
Granted (in dollars per share) | $ / shares   24.45 15.86 26.56
Vested (in dollars per share) | $ / shares   44.25 85.85 64.17
Forfeited (in dollars per share) | $ / shares   21.79 44.99 55.59
Non-vested outstanding at the end of the period (in dollars per share) | $ / shares $ 20.68 $ 20.68 $ 22.97 $ 43.25
Director Shares        
Shares held for settlement of income and payroll tax obligations (in shares)       (14,809)
Performance Shares [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Multiplier applied to PSU awards at settlement 0 0    
Performance Shares [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Multiplier applied to PSU awards at settlement 2 2    
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense | $   $ 10.8 $ 10.3 $ 11.9
Unrecognized stock based compensation expense | $ $ 20.0 20.0    
Fair value of PSUs/RSUs granted in period | $   $ 15.0 $ 17.0 $ 11.7
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting Increment   0.33 0.33 0.33
Share-based compensation arrangement by share-based payment award, increment vesting period   6 months    
Restricted Stock, Shares Settled Gross of Shares for Tax Withholdings [3]   407,529 246,025 241,363
Shares held for settlement of income and payroll tax obligations (in shares)   (115,784) (74,747) (72,181)
Shares Issued in Period   291,745 171,278 169,182
Fair value of PSUs/RSUs Vested in Period | $   $ 9.9 $ 10.8 $ 14.0
Number of Shares Represented by Each RSU   1    
Weighted Average Grant Date Fair Value        
Non-vested at beginning of year (in shares)   1,244,262 604,116 543,737
Granted (in shares)   583,552 1,020,780 417,065
Vested (in shares)   (407,529) (246,025) (241,363)
Forfeited (in shares)   (177,122) (134,609) (115,323)
Non-vested at end of year (in shares) 1,243,163 1,243,163 1,244,262 604,116
Non-vested outstanding at the beginning of the period (in dollars per share) | $ / shares   $ 20.25 $ 37.39 $ 55.01
Granted (in dollars per share) | $ / shares   25.77 16.64 28.08
Vested (in dollars per share) | $ / shares   24.30 43.99 58.06
Forfeited (in dollars per share) | $ / shares   17.26 26.38 43.52
Non-vested outstanding at the end of the period (in dollars per share) | $ / shares $ 21.50 $ 21.50 $ 20.25 $ 37.39
Director Shares        
Shares held for settlement of income and payroll tax obligations (in shares)   (115,784) (74,747) (72,181)
Restricted Stock Units (RSUs) [Member] | Director [Member]        
Weighted Average Grant Date Fair Value        
Granted (in shares)     8,794  
Shares Issued to the Board of Directors [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense | $   $ 1.7 $ 1.6 $ 2.0
[1] (1) During the year ended December 31, 2016, the Company issued shares of common stock to settle PSUs that related to awards granted in 2013. The Company and a majority of grant recipients mutually agreed to net share settle a portion of the awards to cover income and payroll tax withholdings in accordance with the Company’s Equity Plan and individual award agreements.
[2] (1) The number of awards assumes a multiplier of one. The final number of shares of common stock issued may vary depending on the three-year performance multiplier, which ranges from zero to two.
[3] (1) During the years ended December 31, 2018, 2017, and 2016, the Company issued shares of common stock to settle RSUs that related to awards granted in previous years. The Company and a majority of grant recipients mutually agreed to net share settle a portion of the awards to cover income and payroll tax withholdings in accordance with the Company’s Equity Plan and individual award agreements.