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Shareholders' Equity-Common Stock Rollforward (Details) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 01, 2016 | Sep. 26, 2015 | May 01, 2015 | Dec. 01, 2014 | May 01, 2014
Preferred Stock, Shares Authorized | 2,000,000 |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  | $ 400,000 | $ 400,000 | $ 200,000 | $ 200,000 | $ 200,000
Stock Repurchase Program, Dollar Value of Shares Repurchased | $ 680,088 |  |  | 0 | 280,088 |  | 200,000 | 200,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 519,912 |  |  | $ 400,000 | $ 119,912 |  | $ 0 | $ 0
Stock Repurchase Program, Number of Shares Authorized to be Repurchased | 1,200,000 |  |  |  |  |  |  |
Common Stock Issued [Member] |  |  |  |  |  |  |  |
Common stock outstanding, Beginning balance | 125,424 | 125,424 | 125,424 |  |  |  |  |
Shares issued for stock-based compensation awards | 0 | 0 | 0 |  |  |  |  |
Repurchases of common stock | 0 | 0 | 0 |  |  |  |  |
Common stock outstanding, Ending balance | 125,424 | 125,424 | 125,424 |  |  |  |  |
Treasury Stock [Member] |  |  |  |  |  |  |  |
Common stock outstanding, Beginning balance | 34,501 | 29,529 | 25,488 |  |  |  |  |
Shares issued for stock-based compensation awards | (1,372) | (1,155) | (1,506) |  |  |  |  |
Repurchases of common stock | 3,382 | 6,127 | 5,547 |  |  |  |  |
Common stock outstanding, Ending balance | 36,511 | 34,501 | 29,529 |  |  |  |  |
Common Stock at Par Value [Member] |  |  |  |  |  |  |  |
Common stock outstanding, Beginning balance | 90,923 | 95,895 | 99,936 |  |  |  |  |
Shares issued for stock-based compensation awards | 1,372 | 1,155 | 1,506 |  |  |  |  |
Repurchases of common stock | (3,382) | (6,127) | (5,547) |  |  |  |  |
Common stock outstanding, Ending balance | 88,913 | 90,923 | 95,895 |  |  |  |  |

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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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