Leases - Finance and Operating Lease Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Finance lease cost
Amortization of right-of-use assets	$ 361	$ 683
Interest expense	56	109
Operating lease cost	3,398	6,833
Short-term lease cost	105	211
Total lease cost	3,920	7,836
Assets
Operating lease right-of-use assets	65,300	65,300	$ 0
Finance lease right-of-use assets	13,534	13,534
Lease, right-of-use asset	78,834	78,834
Current liabilities
Operating lease liabilities	7,272	7,272	0
Finance lease liabilities	2,331	2,331
Non-current liabilities
Operating lease liabilities	64,152	64,152	$ 0
Finance lease liabilities	6,376	6,376
Total lease liabilities	$ 80,131	$ 80,131