Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018	Nov. 15, 2013
Debt Instrument [Line Items]
Finance lease liabilities	$ 7,144,000
Finance lease liabilities		$ 3,817,000
Less: Deferred financing costs	(463,000)	(634,000)
Less: Current portion due within one year	(13,669,000)	(21,080,000)
Long-term portion	180,255,000	178,002,000
Secured Debt
Debt Instrument [Line Items]
Less: Unamortized discount		(1,936,000)
Secured Debt \| 2013 Term Loan Facility
Debt Instrument [Line Items]
2013 Term Loan Facility outstanding principal balance	179,177,000	197,835,000	$ 325,000,000
Less: Unamortized discount	(1,434,000)		$ (1,625,000)
Secured Debt \| 2013 Revolving Loan Facility
Debt Instrument [Line Items]
2013 Term Loan Facility outstanding principal balance	$ 9,500,000	$ 0

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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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, after accumulated amortization, of debt discount.

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Present value of lessee's discounted obligation for lease payments from finance lease.

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