Leases (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 37,819
Short-term lease cost	3,518
Variable lease cost	7,730
Sublease income	(1,033)
Total operating lease costs	48,034
Total lease liabilities		$ 394,100
Operating leases for real estate facilities that have not yet commenced	$ 553,200
operating leases for real estate facilities that have not yet commenced term	15 years
General and administrative
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 14,823
Short-term lease cost	102
Variable lease cost	3,368
Sublease income	(1,033)
Total operating lease costs	$ 17,260
Weighted average remaining lease term (in years)	10 years 1 month 2 days
Weighted average discount rate	4.40%
Cost of revenues
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 22,996
Short-term lease cost	3,416
Variable lease cost	4,362
Sublease income	0
Total operating lease costs	$ 30,774
Weighted average remaining lease term (in years)	2 years 7 days
Weighted average discount rate	2.60%
Real Estate Arrangements
Lessee, Lease, Description [Line Items]
Remainder of 2019	$ 42,867
2020	47,640
2021	43,948
2022	38,861
2023	37,483
Thereafter	196,390
Total lease payments	407,189
Less: imputed interest	90,096
Total lease liabilities	317,093
Co-location Arrangements
Lessee, Lease, Description [Line Items]
Remainder of 2019	54,265
2020	16,662
2021	4,083
2022	1,030
2023	795
Thereafter	3,869
Total lease payments	80,704
Less: imputed interest	2,871
Total lease liabilities	$ 77,833