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 operating leases	$ 3,162
Operating cash flows from finance leases	1
Financing cash flows from finance leases	188
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	1,676
Finance leases	$ 0