Leases - Components of Lease Cost of Operating and Finance Leases (Details) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
		Jun. 30, 2019	Jun. 30, 2019
Finance lease cost
Amortization of ROU assets	[1]	$ 2,732	$ 4,579
Interest on lease liabilities	[2]	832	1,495
Operating lease cost	[3]	17,919	32,028
Short term lease cost	[3]	144	228
Variable lease cost	[3]	994	1,879
Total lease cost		$ 22,621	$ 40,209

[1] Included in “depreciation and amortization” in consolidated statements of income.

[2] Included in “interest income (expense), net” in consolidated statements of income.

[3] Included in “cost of revenue” and “selling, general and administrative expenses” in consolidated statements of income.