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Equity (Stock Repurchase Program) (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Mar. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Oct. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |  |
Treasury stock, shares, acquired (in shares) |  | 800,000 | 0 |  |  |
Treasury stock value acquired including acquisition costs |  | $ 8,300 |  |  |  |
Treasury stock acquired, average cost per share (in dollars per share) |  | $ 10.22 |  |  |  |
Repurchase of stock |  |  |  | $ 8,304 | $ 45,928 |
Available repurchase of common stock, authorized amount (up to) |  |  | $ 41,700 | $ 41,700 |  |
Unsecured 3.125% Senior Convertible Notes Due September 2022 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Treasury stock acquired, average cost per share (in dollars per share) | $ 11.51 |  |  |  |  |
Stated interest rates (as a percent) | 3.125% |  | 3.125% | 3.125% | 3.125% | 3.125%
Shares repurchased (in shares) | 4,000,000 |  |  |  |  |
Repurchase of stock | $ 45,900 |  |  |  |  |

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