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Stockholders' Equity (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2018 | Dec. 31, 2015 | Jan. 21, 2015
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Value |  | $ (40,000) |  | $ (40,000) |  | $ (37,456) | $ (80,000) |
Number of shares authorized to be repurchased under the plan |  |  |  |  |  |  |  | 20,000,000.0
UpfrontPaymentUnderAcceleratedStockRepurchaseProgram |  | $ 50,000 |  | $ 50,000 |  |  | $ 100,000 |
Stock Repurchased and Retired During Period, Shares | (700,000) | (3,100,000) | (830,000) | (3,187,000) | (736,000) |  | (7,812,000) |
UnsettledForwardContractIndexedtoIssuersStockClassifiedwithinStock |  | $ 10,000 |  | $ 10,000 |  |  | $ 20,000 |
Remaining shares authorized to be repurchased |  |  |  |  |  | 3,600,000 |  |

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- Definition The excess of the amount paid under the accelerated stock repurchase agreement at inception relative to the fair value of the initial delivery of shares, evaluated as an unsettled forward contract indexed to the issuer's stock and reduced from Stockholders' Equity. + References No definition available. + Details
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