Leases - Balance Sheet Information (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019
Leases [Abstract]
Operating lease right-of-use assets	$ 35,111	$ 34,300
Operating - current	6,647
Operating - noncurrent	28,164
Total operating lease liabilities	34,811	$ 35,100
Property and equipment, gross	3,569
Accumulated amortization	(2,417)
Property and equipment, net	1,152
Other current liabilities	1,107
Other long-term liabilities	1,047
Total finance lease liabilities	$ 2,154