Leases - Supplemental Cash Flow Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows paid for operating leases	$ 1,146
Operating cash flows paid for interest portion of finance leases	7
Financing cash flows paid for principal portion of finance leases	22
Right-of-use assets obtained in exchange for lease obligations
Operating leases	37
Finance leases	$ 83