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Stockholders' Equity (Details)
$ / shares in Units, shares in Thousands
 1 Months Ended 9 Months Ended
Nov. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
transaction
$ / shares
shares
Jun. 30, 2015
USD ($)
Stockholders' Equity Note [Abstract]      
Share repurchase program authorized amount     $ 150,000,000
Value of stock repurchased and retired during period $ 150,000,000    
Stock repurchased and retired during period (in shares) | shares   1,326  
Average repurchase price per share (in usd per share) | $ / shares   $ 38.64  
ASR Amount   $ (50,000,000)  
Settlement of shares owed to counterparty   $ 2,000,000  
Stock repurchase program (in transactions) | transaction   2