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Capital Stock - Narrative (Details) - USD ($) $ in Thousands | 9 Months Ended | 230 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Dec. 31, 2016
Equity [Abstract] |  |  |  |
Shares repurchased | 3,000,000 |  | 32,900,000 |
Treasury stock repurchases (in usd) | $ 68,255 | $ 0 | $ 456,600 |
Shares authorized for repurchase | 40,000,000 |  | 40,000,000 |
Shares retired |  |  | 20,000,000 |
Treasury stock | 12,935,926 |  | 12,935,926 | 9,892,680

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- Definition The cash outflow to reacquire common and preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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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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