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Debt - Summary of Unsecured Notes Payable (Details) - USD ($)
$ in Thousands
Mar. 12, 2015
Dec. 31, 2019
Jun. 28, 2019
Dec. 31, 2018
Dec. 28, 2016
Sep. 30, 2016
Jun. 30, 2014
Debt Instrument [Line Items]              
Principal balance   $ 796,247   $ 696,362      
Senior Notes              
Debt Instrument [Line Items]              
Principal balance   800,000   700,000      
Discount, net of accumulated amortization   (616)   (734)      
Capitalized loan fees, net of accumulated amortization   $ (3,137)   $ (2,904)      
Weighted average interest rate (as a percent)   4.27%   4.19%      
Senior Notes | 4.12% Notes Due 2021              
Debt Instrument [Line Items]              
Principal balance   $ 100,000   $ 100,000      
Stated interest rate (as a percent)   4.12%   4.12%     4.12%
Amount of debt issuance             $ 100,000
Senior Notes | 4.58% Notes Due 2024              
Debt Instrument [Line Items]              
Principal balance   $ 150,000   $ 150,000      
Stated interest rate (as a percent)   4.58%   4.58%     4.58%
Amount of debt issuance             $ 150,000
Senior Notes | 4.00% Notes Due 2025              
Debt Instrument [Line Items]              
Principal balance   $ 250,000   $ 250,000      
Stated interest rate (as a percent) 4.00% 4.00%   4.00%      
Amount of debt issuance $ 250,000            
Percentage of principal amount (as a percent) 99.526%            
Effective interest rate (as a percent) 4.058%            
Senior Notes | 4.08% Notes Due 2026              
Debt Instrument [Line Items]              
Principal balance   $ 100,000   $ 100,000      
Stated interest rate (as a percent)   4.08%   4.08%   4.08%  
Amount of debt issuance           $ 100,000  
Senior Notes | 4.24% Notes Due 2028              
Debt Instrument [Line Items]              
Principal balance   $ 100,000   $ 100,000      
Stated interest rate (as a percent)   4.24%   4.24% 4.24%    
Amount of debt issuance         $ 100,000    
Senior Notes | 4.82% Notes Due 2029              
Debt Instrument [Line Items]              
Principal balance   $ 100,000   $ 0      
Stated interest rate (as a percent)   4.82% 4.82% 0.00%      
Amount of debt issuance     $ 100,000        
Senior Notes | Notes Due 2021 and 2024              
Debt Instrument [Line Items]              
Amount of debt issuance             $ 250,000