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Stockholders' Equity:Stock Repurchase (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Feb. 25, 2015
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  | $ 10,268 | $ 23,711 |
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 | 0 | 580,100 | 722,911 |
Treasury Stock, Value, Acquired, Cost Method |  | $ 10,300 | $ 23,700 |
Treasury Stock Acquired, Average Cost Per Share |  | $ 17.70 | $ 32.80 |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | 696,989 |  |  |

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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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