Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Narrative (Details)

v3.19.3
Stockholders' Equity - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 11, 2019
Jan. 23, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Outstanding options that are exercisable (shares) 1,400,000         1,400,000      
Outstanding options that are exercisable, weighted average exercise price (USD per share) $ 59.49         $ 59.49      
Employee Stock Purchase Plan                  
Stock repurchased during period $ 181,188,000 $ 33,717,000 $ 151,585,000 $ 50,832,000 $ 1,895,000 $ 366,500,000      
Authorized stock repurchase amount             $ 200,000,000.0 $ 500,000,000.0 $ 350,000,000.0
Period in force of stock repurchase program           3 years 3 years    
Increase in authorized stock repurchase amount                 $ 150,000,000.0
Remaining authorized stock repurchase amount $ 408,700,000         $ 408,700,000      
Employee Stock Purchase Plan                  
Employee Stock Purchase Plan                  
Share purchase price as percent of market price (as a percent)           85.00%      
Shares available for future purchases (shares)           60,642