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Long-Term Debt - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Dec. 21, 2018
Dec. 31, 2018
Jun. 30, 2017
Sep. 30, 2019
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   $ 350,000,000.0   $ 100,000,000.0   $ 10,000,000.0   $ 600,000,000.0 $ 400,000,000.0   $ 800,000,000.0
Debt instrument, periodic payment, principal   365,000,000.0   10,000,000.0              
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       340,000,000.0              
Outstanding debt balance   1,506,990,000   $ 1,568,560,000              
Debt instrument, periodic payment, principal $ 250,000,000.0                    
LIBOR                      
Debt Instrument [Line Items]                      
30-day Adjusted LIBOR Rate       2.063%              
Scenario Forecast [Member]                      
Debt Instrument [Line Items]                      
Long-term debt, scheduled principal payment         $ 3,800,000            
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%              
Senior notes       $ 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 $ 300,000,000.0   $ 288,800,000              
Loan repayment term 5 years                    
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