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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Assets:    
Cash equivalents $ 1,390,062 $ 1,086,402
Restricted cash 4,847 6,388
Fair Value, Measurements, Recurring    
Assets:    
Cash equivalents 1,390,062 1,086,402
Restricted cash 4,847 6,388
Liabilities:    
Interest rate collar 22,802 3,847
Fair Value, Measurements, Recurring | Quoted Market Prices in Active Markets (Level 1)    
Assets:    
Cash equivalents 503,794 0
Restricted cash 2,054 2,048
Liabilities:    
Interest rate collar 0 0
Fair Value, Measurements, Recurring | Other Observable Inputs (Level 2)    
Assets:    
Cash equivalents 886,268 1,086,402
Restricted cash 2,793 4,340
Liabilities:    
Interest rate collar 22,802 3,847
Fair Value, Measurements, Recurring | Unobservable Inputs (Level 3)    
Assets:    
Cash equivalents 0 0
Restricted cash 0 0
Liabilities:    
Interest rate collar $ 0 $ 0