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7. Stockholders' Equity Treasury Shares (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Equity, Class of Treasury Stock [Line Items] |  |
Stock Repurchase Program, Authorized Amount | $ 18.0 |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 3.3 |
Treasury Class-A [Member] |  |
Equity, Class of Treasury Stock [Line Items] |  |
Treasury Stock, Shares | 122 | 122
Treasury Class B [Member] |  |
Equity, Class of Treasury Stock [Line Items] |  |
Treasury Stock, Shares | 917 | 917

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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29,30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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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