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Stockholders' Equity (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 21, 2015 | Dec. 31, 2014 | Feb. 25, 2010
Class of Stock [Line Items] |  |  |  |  |  |
Stock Repurchased and Retired During Period, Value |  | $ (17,600) | $ (80,000) |  |  |
Number of shares authorized to be repurchased under the plan |  |  |  | 20,000,000.0 | 19,000,000 |
UpfrontPaymentUnderAcceleratedStockRepurchaseProgram |  |  | $ 100,000 |  |  |
Stock Repurchased and Retired During Period, Shares | (736,000) |  | (7,812,000) |  |  |
UnsettledForwardContractIndexedtoIssuersStockClassifiedwithinStock |  |  | $ 20,000 |  |  |
Additional number of shares authorized to be repurchased |  |  |  |  |  | 12,500,000
Cumulative shares that have been repurchased in stock repurchase program |  |  |  |  | 26,300,000 |
Cumulative value of shares that have been repurchased in stock repurchase program |  |  |  |  | $ 428,900 |
Remaining shares authorized to be repurchased |  | 11,500,000 |  |  | 5,200,000 |

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