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Equity (Stock Repurchase Program) (Details) - USD ($) $ / shares in Units, shares in Millions | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Aug. 04, 2016 | Feb. 29, 2016
Stock Repurchase Program |  |  |  |  |
Repurchase of common stock, authorized amount |  |  |  | $ 50,000,000.0 | $ 50,000,000.0
Common stock repurchased (in shares) | 4.0 |  |  |  |
Repurchase of stock | $ 45,900,000 | $ 45,928,000 | $ 98,429,000 |  |
Average cost per share (in dollars per share) | $ 11.51 |  |  |  |
Treasury stock, shares, acquired |  |  | 10.2 |  |
Treasury stock value acquired including acquisition costs |  |  | $ 98,400,000 |  |
Treasury stock acquired, average cost per share (in dollars per share) |  |  | $ 9.67 |  |
Available repurchase of common stock, authorized amount (up to) | $ 4,100,000 | $ 4,100,000 |  |  |
3.125% senior convertible notes |  |  |  |  |
Stock Repurchase Program |  |  |  |  |
Stated interest rates (as a percent) | 3.125% | 3.125% |  |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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