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Common and Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Dec. 01, 2015 | Apr. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Equity [Abstract] |  |  |  |  |
Increase in share repurchase authorized amount | $ 300,000 |  |  |  |
Purchase of common stock (in shares) |  |  | 106,000 | 726,000 |
Repurchase of common stock, including subsequent settlements |  |  | $ 9,800 | $ 53,900 |
Purchase of common stock |  | $ 200 | 9,799 | $ 55,971 |
Remaining authorized repurchase amount |  |  | $ 570,200 |  |
Common stock, authorized (in shares) |  |  | 150,000,000 |  | 150,000,000
Common stock, par value (in dollars per share) |  |  | $ 0.01 |  | $ 0.01
Preferred stock, authorized (in shares) |  |  | 5,000,000 |  | 5,000,000
Preferred stock, par value (in dollars per share) |  |  | $ 0.01 |  | $ 0.01
Preferred stock, shares outstanding (in shares) |  |  | 0 |  | 0

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