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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Assets:    
Cash equivalents $ 365,589 $ 980,580
Fair Value, Measurements, Recurring    
Assets:    
Cash equivalents 365,589 980,580
Restricted cash 6,369 4,352
Liabilities:    
Interest rate collar 11,527 16,908
Fair Value, Measurements, Recurring | Quoted Market Prices in Active Markets (Level 1)    
Assets:    
Cash equivalents 0 504,980
Restricted cash 4,631 2,054
Liabilities:    
Interest rate collar 0 0
Fair Value, Measurements, Recurring | Other Observable Inputs (Level 2)    
Assets:    
Cash equivalents 365,589 475,600
Restricted cash 1,738 2,298
Liabilities:    
Interest rate collar 11,527 16,908
Fair Value, Measurements, Recurring | Unobservable Inputs (Level 3)    
Assets:    
Cash equivalents 0 0
Restricted cash 0 0
Liabilities:    
Interest rate collar $ 0 $ 0