Leases - Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease right-of-use assets, net of amortization	$ 21,510	$ 0
Financing lease right-of-use assets, net of amortization	8,238	0
Total assets	29,748
Current portion of operating lease liabilities	5,677	0
Current portion of financing lease liabilities	2,935	0
Total current	8,612
Operating lease liabilities	16,485	0
Financing lease liabilities	4,291	$ 0
Total noncurrent	20,776
Total liabilities	29,388
Operating lease, right-of-use asset, accumulated amortization	2,900
Finance lease, right-of-use asset, accumulated amortization	$ 5,100