Leases - Cash Paid and Lease Recognition (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 28,831
Financing cash flows from finance leases	13,598	$ 12,594
Right-of-use lease assets obtained in the exchange for lease liabilities:
Operating leases	3,894
Finance leases	$ 9,352