Leases (Details 2) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating Leases
Other assets (noncurrent)	$ 0	$ 17,998
Liabilites subject to compromise (current portion)	943
Liabilites subject to compromise (noncurrent portion)	481
Total operating lease liabilities	1,424	937
Lessee Lease Description [Line Items]
Property, plant, and equipment, net	68,468		$ 654,372
Other current liabilities	1,556
Other long-term liabilities	181
Total finance lease liabilities	1,737
Operating Lease Liabilities Payments Due [Abstract]
2019	515
2020	937
2021	109
2022	13
2023	13
Thereafter	370
Total	1,957
Less: interest	533
Total principal payments	1,424	$ 937
Less: current portion	943
Lease obligations, net of current portion	481
Finance Lease Liabilities Payments Due [Abstract]
2019	846
2020	871
2021	63
2022	0
2023	0
Thereafter	0
Total	1,780
Less: Interest	43
Total principal payments	1,737
Less: current portion	1,556
Lease obligations, net of current portion	181
Finance Leased Assets [Member]
Lessee Lease Description [Line Items]
Property, plant, and equipment	13,967
Accumulated amortization	(10,265)
Property, plant, and equipment, net	$ 3,702