Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating Leases
Operating lease right-of-use assets	$ 218,625	$ 194,500	$ 0
Total operating lease liabilities	268,361	$ 256,400
Accrued Expenses and Other Current Liabilities [Member]
Operating Leases
Total operating lease liabilities	47,329
Operating Lease Liabilities [Member]
Operating Leases
Total operating lease liabilities	$ 221,032