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Stockholders' Equity - Narrative (Details) - USD ($) | 5 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Feb. 06, 2018
Class Of Stock [Line Items] |  |  |  |
Stock repurchased program, authorized amount |  |  |  | $ 275,000,000
Stock repurchased and retired during period, shares | 1,358,480 | 1,412,000 | 1,065,000 |
Stock repurchased and retired during period, value | $ 133,700,000 |  |  |
Stock repurchase program, remaining authorized repurchase amount | $ 141,300,000 | $ 141,300,000 |  |
Restricted stock units (RSUs) [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Share-based compensation arrangement by share-based payment award, non-option equity instruments, outstanding, number | 717,358 | 717,358 |  |
Performance share units (PSUs) [Member] |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Share-based compensation arrangement by share-based payment award, non-option equity instruments, outstanding, number | 85,010 | 85,010 |  |

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