Leases - Supplemental Cash Flows (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	$ 4,285
Operating cash flows from finance leases	22
Financing cash flows from finance leases	$ 101
Weighted Average Remaining Lease term
Operating leases	3 years 5 months 19 days
Finance leases	3 years 3 months 4 days
Weighted Average Discount Rate
Operating leases	4.71%
Finance leases	7.16%