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Stockholders' Equity - Equity and Securities Repurchase Programs (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Proceeds from common stock offering, net of issuance costs | $ 373,000,000 | $ 0 | $ 373,000,000 | $ 0 |
Number of warrants issued (in shares) |  |  |  |  | 13,490,236
Striking price of Warrants (USD per share) |  |  |  |  | $ 53.8475
Trading days measurement period (in days) |  | 160 days |  |  |
Stated interest rate for Warrants |  | 1.125% |  |  |
Threshold percentage of stock price trigger |  | 0.625% |  |  |
Common Stock |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Shares issued in public offering (in shares) | 5,750,000 |  |  |  |
Offering price (USD per share) | $ 64.90 |  |  |  |
Common Stock | December 2015 Repurchase Program |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Approved amount related to stock repurchase program |  |  | $ 50,000,000 |  |

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