Leases (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 38,110	$ 75,929
Short-term lease cost	3,875	7,393
Variable lease cost	9,024	16,754
Sublease income	(919)	(1,952)
Total operating lease costs	50,090	98,124
Operating leases for real estate facilities that have not yet commenced	$ 553,300	$ 553,300
operating leases for real estate facilities that have not yet commenced term		15 years
Real Estate Arrangements
Lessee, Lease, Description [Line Items]
Weighted average remaining lease term (in years)	10 years 1 month 6 days	10 years 1 month 6 days
Weighted average discount rate	4.10%	4.10%
Remainder of 2019	$ 25,754	$ 25,754
2020	47,080	47,080
2021	43,223	43,223
2022	39,188	39,188
2023	37,826	37,826
Thereafter	196,659	196,659
Total lease payments	389,730	389,730
Less: imputed interest	86,873	86,873
Total lease liabilities	302,857	302,857
Real Estate Arrangements | General and administrative
Lessee, Lease, Description [Line Items]
Operating lease cost	14,166	28,989
Short-term lease cost	103	205
Variable lease cost	3,670	7,038
Sublease income	(919)	(1,952)
Total operating lease costs	$ 17,020	$ 34,280
Co-location Arrangements
Lessee, Lease, Description [Line Items]
Weighted average remaining lease term (in years)	3 years 2 months 12 days	3 years 2 months 12 days
Weighted average discount rate	2.90%	2.90%
Remainder of 2019	$ 44,924	$ 44,924
2020	24,224	24,224
2021	9,167	9,167
2022	5,571	5,571
2023	3,850	3,850
Thereafter	9,902	9,902
Total lease payments	97,638	97,638
Less: imputed interest	5,273	5,273
Total lease liabilities	92,365	92,365
Co-location Arrangements | Cost of revenues
Lessee, Lease, Description [Line Items]
Operating lease cost	23,944	46,940
Short-term lease cost	3,772	7,188
Variable lease cost	5,354	9,716
Sublease income	0	0
Total operating lease costs	$ 33,070	$ 63,844