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Long-Term Debt - Schedule Of Consolidated Secured Leverage Ratio (Details) - Amended and Restated Credit Agreement
Jun. 30, 2017
March 31, 2018 through and including June 30, 2018  
Debt Instrument [Line Items]  
Maximum Consolidated Secured Leverage Ratio 3.00
September 30, 2018 and each fiscal quarter thereafter  
Debt Instrument [Line Items]  
Maximum Consolidated Secured Leverage Ratio 2.50