XML 84 R51.htm IDEA: XBRL DOCUMENT v3.20.1
Long-Term Debt - Additional Information (Details) - USD ($)
3 Months Ended
Jun. 30, 2020
Dec. 21, 2018
Mar. 31, 2020
Dec. 31, 2018
Jun. 30, 2017
Dec. 31, 2019
Mar. 31, 2019
Mar. 11, 2019
Nov. 15, 2018
Jun. 28, 2017
Sep. 18, 2014
Apr. 17, 2014
Debt Instrument [Line Items]                        
Unsecured revolving credit facility     $ 100,000,000.0 $ 100,000,000.0         $ 600,000,000.0 $ 400,000,000.0   $ 800,000,000.0
Debt instrument, periodic payment, principal     10,000,000.0 330,000,000.0                
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     320,000,000.0                  
Outstanding debt balance     $ 1,542,105,000     $ 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        
Forecast                        
Debt Instrument [Line Items]                        
Debt instrument, periodic payment, principal $ 10,000,000.0                      
Term Loan                        
Debt Instrument [Line Items]                        
Debt instrument, periodic payment, principal       $ 67,500,000                
Unsecured term loans   $ 300,000,000.0 $ 281,300,000     $ 285,000,000.0            
Loan repayment term   5 years                    
Term Loan | LIBOR                        
Debt Instrument [Line Items]                        
30-day Adjusted LIBOR Rate     1.00%                  
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                    
Term Loan | Forecast                        
Debt Instrument [Line Items]                        
Long-term debt, scheduled principal payment in next three months $ 3,800,000                      
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     0.813%                  
Long-term Debt | LIBOR                        
Debt Instrument [Line Items]                        
30-day Adjusted LIBOR Rate     1.00%