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Treasury Stock (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Feb. 10, 2016
Equity [Abstract] |  |  |  |
Shares available for repurchase (in shares) | 300,000 |  |  |
Shares repurchased (in shares) | 1,817,000 | 384,000 | 153,000 |
Cost of shares repurchased | $ 89,395 | $ 16,168 | $ 3,607 |
Treasury stock reissued (in shares) |  | 15,000 | 30,000 |
Subsequent event |  |  |  |
Class of stock [Line Items] |  |  |  |
Stock repurchase program, additional number of shares authorized |  |  |  | 100,000
Stock repurchase program, number of shares authorized to be repurchased |  |  |  | 400,000

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- Definition Number of treasury shares (units) reissued during the period, excluding reissuance of shares (units) held in treasury used to satisfy equity-based compensation obligations exercised by the holders of such rights. Upon reissuance of shares (units) from treasury, either the common or preferred stock (unit) reissued is outstanding. + 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 04 -Article 3 + Details
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