Leases - Supplemental Cash Flow Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 12,149
Operating cash flows from finance leases	1,200
Financing cash flows from finance leases	3,980
ROU assets obtained in exchange or lease liabilities:
Operating leases	$ 2,030