Leases - Supplemental Cash Flow Information (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from finance leases	$ 109
Operating cash flows from operating leases	10,667
Financing cash flows from finance leases	1,618
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 2,878