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Leases - 840 Guidance (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Lessee, Lease, Description [Line Items]    
Rent expense $ 63,200 $ 58,800
Sublease income 3,800 $ 3,600
Bandwidth Commitments    
Lessee, Lease, Description [Line Items]    
2019 54,561  
2020 78,683  
2021 75,991  
2022 72,579  
2023 70,101  
Thereafter 599,339  
Total 951,254  
Purchase Order Commitments    
Lessee, Lease, Description [Line Items]    
2019 138,777  
2020 24,420  
2021 8,463  
2022 5,233  
2023 2,156  
Thereafter 3,709  
Total $ 182,758