Leases - Balance Sheet Information (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Operating leases
Other assets	$ 51,744
Other current liabilities	(36,899)
Other long-term liabilities	(20,012)
Total operating lease liabilities	(56,911)
Financing leases
Other property and equipment, at cost	3,505
Accumulated depreciation	(634)
Net property and equipment	2,871
Other current liabilities	(1,384)
Other long-term liabilities	(1,405)
Total financing lease liabilities	$ (2,789)