Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Operating leases:
Right of use assets	$ 39,382
Finance leases:
Right of use asset, cost	19
Accumulated amortization	(10)
Right of use asset, net	9
Total ending right of use asset - net:	39,391	$ 0
Current
Operating	6,343
Finance	78
Non-current
Operating	34,844
Finance	$ 200