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Stockholders' Equity - Narrative (Details) - USD ($) | 9 Months Ended | 14 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016
Class Of Stock [Line Items] |  |  |
Stock repurchased program, authorized amount | $ 200,000,000 |  | $ 200,000,000
Stock repurchased and retired during period, shares | 2,869,000 | 4,094,000 | 3,831,300
Stock repurchased and retired during period, value |  |  | $ 181,500,000
Stock repurchase program, remaining authorized repurchase amount | $ 18,500,000 |  | $ 18,500,000
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 | 1,100,000 |  | 1,100,000

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