Financing and Operating Leases - Operating and Financing Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jan. 01, 2019
Leases
Operating lease right-of-use assets, net of amortization	$ 5,443	$ 6,312
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Property, Plant, Equipment and Operating Lease Right-of-Use Asset
Operating lease liability (current)	$ 2,470	2,283
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued Liabilities, Current
Long-term operating liability	$ 3,890	5,067
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other Liabilities, Noncurrent
Total operating lease liabilities	$ 6,360	7,350
Property, equipment and leasehold improvements	80,736	80,577
Accumulated depreciation	(48,621)	(44,801)
Total property, equipment and leasehold improvements, net	37,558	42,088
Financing lease liability (current)	$ 2,122	2,211
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued Liabilities, Current
Long-term financing liability	$ 3,513	3,886
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other Liabilities, Noncurrent
Total financing lease liabilities	$ 5,635	6,097
Adjustments | Accounting Standards Update 2016-02
Leases
Operating lease right-to-use assets			$ 8,025
Total operating lease liabilities			$ 8,813
Financing leases
Leases
Property, equipment and leasehold improvements	9,019	8,256
Accumulated depreciation	(1,740)	(1,094)
Total property, equipment and leasehold improvements, net	$ 7,279	$ 7,162
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Property, Plant, Equipment and Operating Lease Right-of-Use Asset