Leases - Supplemental Cash Flow and Other Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Operating cash flows information:
Cash paid for amounts included in the measurement of lease liabilities	$ 31,208	$ 62,222
Non-cash activity:
Right of use assets obtained in exchange for operating lease obligations	$ 9,823	$ 25,083