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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