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Compensation Plans: Stock Based (Details) $ / shares in Units, $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) $ / shares shares | Jun. 30, 2019 shares | Sep. 30, 2018 USD ($) | Jun. 30, 2018 shares | Sep. 30, 2019 USD ($) shares $ / shares | Sep. 30, 2018 USD ($) | Dec. 31, 2018 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share available for grant |  | 4,100,000 | 4,100,000 |  |  |  | 4,100,000 |  |
Director [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares issued to directors |  |  |  | 96,719 |  | 58,572 |  |  |
Performance Shares (PSUs) |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Multiplier applied to PSU awards at settlement |  | 0 | 0 |  |  |  | 0 |  |
Award vesting period |  | 3 years |  |  |  |  |  |  |
Stock-based compensation expense | $ |  |  | $ 2.9 |  | $ 3.0 |  | $ 8.6 | $ 7.7 |
Unrecognized stock based compensation expense | $ |  | $ 19.7 | $ 19.7 |  |  |  | $ 19.7 |  |
Non-vested PSUs/RSUs | [1] | 2,117,364 | 2,117,364 |  |  |  | 2,117,364 |  | 1,711,259
Fair value of non-vested PSUs/RSUs | $ / shares |  | $ 16.86 | $ 16.86 |  |  |  | $ 16.86 |  | $ 20.68
PSUs/RSUs granted in period | [1] |  |  |  |  |  | 793,125 |  |
Fair vale of PSUs/RSUs granted in period, per share | $ / shares |  |  |  |  |  |  | $ 12.80 |  |
Vested PSUs/RSUs | [1] |  |  |  |  |  | (346,021) |  |
Fair value of vested PSUs/RSUs | $ / shares |  |  |  |  |  |  | $ 26.31 |  |
Forfeited PSUs/RSUs | [1] |  |  |  |  |  | (40,999) |  |
Fair value of forfeited PSUs/RSUs | $ / shares |  |  |  |  |  |  | $ 17.96 |  |
PSU multiplier cap |  |  |  |  |  |  | 1 |  |
Fair value of PSUs/RSUs granted in period, total | $ |  |  |  |  |  |  | $ 10.2 |  |
Net shares of common stock issued upon settlement |  |  |  |  |  |  | 0 |  |
Performance Shares (PSUs) | Minimum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Multiplier applied to PSU awards at settlement |  | 0 | 0 |  |  |  | 0 |  |
Performance Shares (PSUs) | Maximum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Multiplier applied to PSU awards at settlement |  | 2 | 2 |  |  |  | 2 |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Award vesting period |  | 3 years |  |  |  |  |  |  |
Stock-based compensation expense | $ |  |  | $ 2.9 |  | $ 3.0 |  | $ 8.4 | $ 8.0 |
Unrecognized stock based compensation expense | $ |  | $ 21.4 | $ 21.4 |  |  |  | $ 21.4 |  |
Non-vested PSUs/RSUs |  | 1,644,372 | 1,644,372 |  |  |  | 1,644,372 |  | 1,243,163
Fair value of non-vested PSUs/RSUs | $ / shares |  | $ 16.04 | $ 16.04 |  |  |  | $ 16.04 |  | $ 21.50
PSUs/RSUs granted in period |  |  |  |  |  |  | 978,932 |  |
Fair vale of PSUs/RSUs granted in period, per share | $ / shares |  |  |  |  |  |  | $ 12.36 |  |
Vested PSUs/RSUs |  |  |  |  |  |  | (466,535) |  |
Fair value of vested PSUs/RSUs | $ / shares |  |  |  |  |  |  | $ 21.93 |  |
Forfeited PSUs/RSUs |  |  |  |  |  |  | (111,188) |  |
Fair value of forfeited PSUs/RSUs | $ / shares |  |  |  |  |  |  | $ 19.94 |  |
Fair value of PSUs/RSUs granted in period, total | $ |  |  |  |  |  |  | $ 12.1 |  |
Number of shares represented by each RSU |  | 1 | 1 |  |  |  | 1 |  |
Net shares of common stock issued upon settlement |  |  |  |  |  |  | 334,399 |  |
[1] | (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.

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