Quarterly report pursuant to Section 13 or 15(d)

Significant Accounting Policies - Additional Information (Details)

v3.19.3
Significant Accounting Policies - Additional Information (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
shares
Sep. 30, 2019
USD ($)
Segment
shares
Jun. 30, 2019
USD ($)
May 16, 2019
USD ($)
Jan. 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
Significant Accounting Policies [Line Items]            
Number of operating segment | Segment   1        
Debt and capital lease obligations $ 45,000,000 $ 45,000,000       $ 45,000,000
Long-term debt, fair value 46,200,000 46,200,000       $ 45,600,000
Operating lease, right-of-use asset $ 67,400,000 $ 67,400,000        
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:OtherAssetsNoncurrent us-gaap:OtherAssetsNoncurrent        
Operating lease, liability $ 68,553,000 $ 68,553,000        
Accounting Standards Update 2016-02 [Member]            
Significant Accounting Policies [Line Items]            
Operating lease, right-of-use asset         $ 68,000,000.0  
Operating lease, liability         $ 69,100,000  
2018 Share Repurchase Program [Member] | Maximum [Member]            
Significant Accounting Policies [Line Items]            
Stock repurchase program, authorized amount     $ 250,000,000.0      
2019 Share Repurchase Program [Member]            
Significant Accounting Policies [Line Items]            
Stock repurchased and retired during period, shares | shares 254,294 1,406,208        
Stock repurchased and retired during period, value $ 40,600,000 $ 205,300,000        
Stock repurchase program, remaining authorized repurchase amount $ 276,400,000 $ 276,400,000        
2019 Share Repurchase Program [Member] | Maximum [Member]            
Significant Accounting Policies [Line Items]            
Stock repurchase program, authorized amount       $ 350,000,000.0