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Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Leases [Abstract]      
Operating lease ROU assets $ 144,326 $ 0  
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:OperatingLeaseRightOfUseAsset    
Current operating lease liabilities $ 39,349 0  
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:AccruedLiabilitiesCurrent    
OperatingLeaseLiabilityNoncurrent $ 105,701 0  
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:OperatingLeaseLiabilityNoncurrent    
Weighted average remaining lease term for operating leases 6 years    
Weighted average discount rate for operating leases 5.00%    
Build-to-Suit Assets [Abstract]      
Build-to-suit building $ 784,644 787,534  
Deposit paid to landlord 46,894 41,986  
Components of Lease Expense [Abstract]      
Operating lease cost 51,072    
Variable lease cost 3,387    
Short-term lease cost 169    
Sublease income (5,743)    
Total lease expense 48,885    
Supplemental Cash Flow Information Related to Leases [Abstract]      
Operating cash outflow 54,993    
ROU assets obtained in exchange for lease liabilities 184,502    
Maturities of Operating Lease Liabilities [Abstract]      
2020 45,942    
2021 38,545    
2022 23,822    
2023 17,949    
2024 12,876    
Thereafter 31,368    
Total 170,502    
Less: Imputed interest 25,452    
Total lease liability 145,050    
Additional lease liabilities not yet commenced $ 8,900    
Minimum Future Operating Leases [Abstract]      
2019   39,358  
2020   27,553  
2021   20,266  
2022   11,723  
2023   9,950  
Thereafter   7,628  
Total minimum lease payments   116,478  
Minimum Future Financing Obligations [Abstract]      
2019   726  
2020   748  
2021   757  
2022   770  
2023   794  
Thereafter   1,148  
Total minimum lease payments   4,943  
Rent and Interest Expense [Abstract]      
Rent expense for operating leases   50,400 $ 50,700
Interest expense associated with financing obligations   200 $ 200
Build-to-Suit Building [Member]      
Build-to-Suit Assets [Abstract]      
Build-to-suit building   19,400  
Financing obligation   9,900  
Deposit paid to landlord   9,900  
Tenant incentive asset   4,000  
Deferred tenant incentive liability   $ 3,700  
Minimum [Member]      
Leases [Abstract]      
Remaining lease terms 1 year    
Maximum [Member]      
Leases [Abstract]      
Remaining lease terms 25 years    
Extension period for leases 20 years    
Termination period for leases 1 year