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Debt - Certain Covenants (Details) - Second Amended and Restated Credit Agreement | 6 Months Ended
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Jun. 30, 2018
Revolving Credit Facility |
Debt Instrument [Line Items] |
Percentage of utilized line of credit | 25.00%
Lines of credit |
Debt Instrument [Line Items] |
Maximum debt to consolidated EBITDA ratio | 4.75
Lines of credit | Revolving Credit Facility | June 30, 2018 and thereafter |
Debt Instrument [Line Items] |
Required minimum Debt to Consolidated EBITDA ratio | 3.5

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