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Stockholders' Equity - Repurchase Program (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Feb. 04, 2016 | Jun. 30, 2016 | Jun. 30, 2016 | Jun. 30, 2015
Class of Stock [Line Items] |  |  |  |
Shares repurchased (in shares) |  | 191,291 | 191,291 |
Repurchase of common stock |  | $ (26,000,000) | $ (26,037,000) | $ 0
Common Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock repurchase program, approved amount | $ 500,000,000 |  |  |
Stock repurchase program, authorized time period | 18 months |  |  |

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- Definition The cash outflow to reacquire common stock during the period. + 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=56944662&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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