Leases - Schedule of Operating Lease Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Operating Leases
Operating lease right-of-use assets	$ 17,882	$ 0
Operating lease liabilities	5,494	0
Long-term operating lease liabilities	13,238	$ 0
Total operating lease liabilities	$ 18,732