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Long-Term Debt - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 21, 2018
Dec. 31, 2018
Jun. 30, 2017
Jun. 30, 2020
Dec. 31, 2019
Mar. 31, 2019
Mar. 11, 2019
Jun. 28, 2017
Sep. 18, 2014
Apr. 17, 2014
Debt Instrument [Line Items]                    
Unsecured revolving credit facility       $ 200,000,000.0 $ 100,000,000.0     $ 400,000,000.0   $ 800,000,000.0
Debt instrument, periodic payment, principal         330,000,000.0          
Proceeds from issuance of debt   $ 2,800,000                
Write off of deferred debt issuance cost     $ 200,000              
Debt issuance costs               $ 1,600,000    
Unsecured term loans       310,000,000.0            
Outstanding debt balance       $ 1,628,909,000 1,555,343,000          
Debt instrument, periodic payment, principal $ 250,000,000.0                  
Minimum                    
Debt Instrument [Line Items]                    
Debt instrument, variable interest rate       1.00%            
Maximum                    
Debt Instrument [Line Items]                    
Debt instrument, variable interest rate       1.75%            
Unsecured Senior Notes                    
Debt Instrument [Line Items]                    
Debt instrument, face amount                 $ 500,000,000.0  
Debt instrument interest rate stated percentage             4.50%   4.20%  
Outstanding debt balance       $ 500,000,000.0 $ 500,000,000.0 $ 350,000,000.0        
4.500% Senior Notes, Semi-Annual Interest Payments, Net of the Unamortized Discount, Balloon Due 2029                    
Debt Instrument [Line Items]                    
Debt instrument interest rate stated percentage       4.50% 4.50%          
Senior notes       $ 350,000,000.0 $ 350,000,000.0   $ 350,000,000.0      
Term Loan                    
Debt Instrument [Line Items]                    
Debt instrument, periodic payment, principal   $ 67,500,000                
Unsecured term loans $ 300,000,000.0     $ 277,500,000 $ 285,000,000.0          
Loan repayment term 5 years                  
Term Loan | LIBOR                    
Debt Instrument [Line Items]                    
30-day Adjusted LIBOR Rate       0.188%            
Term Loan | Minimum                    
Debt Instrument [Line Items]                    
Unsecured term loans $ 300,000,000.0                  
Term Loan | Maximum                    
Debt Instrument [Line Items]                    
Unsecured term loans $ 450,000,000.0                  
Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Credit facility, outstanding amount                 $ 475,000,000.0  
Revolving Credit Facility | LIBOR                    
Debt Instrument [Line Items]                    
30-day Adjusted LIBOR Rate       0.188%            
Long-term Debt | LIBOR                    
Debt Instrument [Line Items]                    
30-day Adjusted LIBOR Rate       0.188%