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Existing Revolving Credit Facility Narrative (Details) - Revolving Credit Facility [Member]
$ in Millions
Mar. 31, 2017
USD ($)
Long-Term Debt Narrative [Line Items]  
Line of Credit Facility, Maximum Borrowing Capacity $ 523.5
Line of Credit Facility, Remaining Borrowing Capacity 507.3
Line of Credit Facility, Standby Letters of Credit Issued Against the Facility $ 16.2