Leases - Components of Lease Expense (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Operating lease cost
Operating lease cost	$ 7,456
Short-term and variable lease cost	1,975
Finance lease cost
Amortization of ROU assets	2,511
Interest expense on lease liabilities	24,603
Total lease cost	$ 36,545