Long-Term Debt and Interest Expense - Long-Term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Finance leases and other notes	$ 51,163	$ 60,909
Unamortized discounts and deferred financing costs	(10,212)	(11,169)
Total long-term debt	340,951	349,740
Less current portion	24,145	27,039
Total non-current portion of long-term debt	316,806	322,701
10.75% Senior Notes due 2023
Debt Instrument [Line Items]
Long-term debt, gross	$ 300,000	$ 300,000

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Amount of short-term and long-term debt and lease obligation.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Amount of long-term debt and lease obligation, classified as noncurrent.

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Amount of long-term debt and lease obligation, classified as current.

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