Leases and Right of Use Assets - Maturity of Lease Liabilities (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Finance Leases
2019 (remaining)	$ 13,617
2020	25,393
2021	9,959
2022	9,959
2023	20,817
Thereafter	8,110
Total lease payments	87,855
Less: Imputed interest	(7,178)
Total lease obligations	80,677
Less: Current obligations	(21,665)
Long-term finance lease obligations	59,012
Operating Leases
2019 (remaining)	3,667
2020	5,911
2021	1,575
2022	1,010
2023	706
Thereafter	1,394
Total lease payments	14,263
Less: Imputed interest	(648)
Total operating lease liabilities	13,615
Less: Current obligations	(7,578)
Long-term lease obligations	$ 6,037