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Stockholders' Equity:Stock Repurchase (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Feb. 25, 2015
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ 4,930,000 |  | $ 10,268,000 |
ShareRepurchaseProgram2015 [Member] |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  | 2,000,000
Treasury stock, shares acquired | 200,000 | 0 | 580,100 |
Treasury Stock, Value, Acquired, Cost Method | $ 4,900,000 | $ 0 | $ 10,300,000 |
Treasury Stock Acquired, Average Cost Per Share | $ 24.65 |  | $ 17.70 |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | 496,989 |  |  |

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