Leases - Supplemental Cash Flows (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 operating leases	$ 8,631
Operating cash flows from finance leases	38
Financing cash flows from finance leases	$ 227
Weighted Average Remaining Lease term
Operating leases	3 years 18 days
Finance leases	3 years 6 months 18 days
Weighted Average Discount Rate
Operating leases	4.74%
Finance leases	6.91%