Leases - Components of Lease Expense (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Leases [Abstract]
Operating lease cost	$ 1,401
Finance lease cost
Amortization of ROU asset	24
Interest expense	7
Short-term lease cost	143
Variable lease cost	455
Total lease cost	$ 2,030