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Revolving Credit Facility and Long-Term Debt - Financial Covenants (Details) - Credit Agreement | 9 Months Ended
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Sep. 30, 2018 USD ($)
Debt Instrument [Line Items] |
Consolidated EBITDA | 1.25
Consolidated Net Income | $ 0
Facility Capital Expenditures | $ 30,000,000
January 1, 2018 and thereafter |
Debt Instrument [Line Items] |
Consolidated Total Leverage Ratio | 3.50

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