Leases - Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease right of use assets	$ 23,401	$ 0
Operating lease liabilities, current portion	3,561	0
Operating lease liabilities, long-term portion	21,836	0
Total operating lease liabilities	25,397
Finance lease right of use asset	235
Accumulated depreciation	(26)
Total finance lease asset, net	209	0
Current installments of obligations under finance lease	121	0
Long-term portion of obligations under finance leases	135	$ 0
Total finance lease liabilities	$ 256