Leases - Finance and Operating Lease Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Finance lease cost
Amortization of right-of-use assets	$ 322
Interest expense	53
Operating lease cost	3,434
Short-term lease cost	107
Total lease cost	3,916
Assets
Operating lease right-of-use assets	68,458
Finance lease right-of-use assets	12,886
Lease, right-of-use asset	81,344
Current liabilities
Operating lease liabilities	7,630	$ 0
Finance lease liabilities	2,401
Non-current liabilities
Operating lease liabilities	66,975
Finance lease liabilities	6,150
Total lease liabilities	$ 83,156