Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Operating leases:
Operating lease ROU asset	$ 303,928	$ 0
Liabilities
Current operating lease liabilities	93,090	0
Long-term operating lease liabilities	225,607	$ 0
Total operating lease liabilities	$ 318,697