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Equity (Stock Repurchase Program) (Details) - USD ($) | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Aug. 04, 2016 | Feb. 15, 2016 | Dec. 31, 2015
Stock Repurchase Program |  |  |  |  |
Repurchase of common stock, authorized amount |  |  |  | $ 50,000,000.0 |
Treasury stock, shares, acquired | 9,500,000 | 44,235 |  |  |
Treasury stock value acquired including acquisition costs | $ 91,800,000 | $ 600,000 |  |  |
Treasury stock acquired, average cost per share (in dollars per share) | $ 9.71 | $ 12.66 |  |  |
Available repurchase of common stock, authorized amount (up to) | $ 7,000,000 |  |  |  | $ 48,700,000
Subsequent Event |  |  |  |  |
Stock Repurchase Program |  |  |  |  |
Repurchase of common stock, authorized amount |  |  | $ 50,000,000 |  |

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- Definition Number of shares that have been repurchased and retired during the period. + 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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