Leases - Components of Lease Expense (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Leases [Abstract]
Operating lease cost	$ 81,070
Short-term lease cost	2,484
Amortization of right-of-use assets	6,108
Interest on lease liabilities	1,181
Total finance lease cost	7,289
Total lease costs	$ 90,843