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 paid for operating leases	$ 2,444
Operating cash flows paid for interest portion of finance leases	21
Financing cash flows paid for principal portion of finance leases	61
Right-of-use assets obtained in exchange for lease obligations
Operating leases	280
Finance leases	$ 517