Long-Term Debt - Schedule Of Unrestricted Cash and Cash Equivalents (Details)	Jun. 30, 2017 USD ($)
Debt Instrument [Line Items]
Minimum Cash	$ 100,000,000
Credit Agreement February 2016 Amendment [Member] | Greater than or equal to 4.00 to 1.00 [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Minimum Cash	100,000,000.00
Credit Agreement February 2016 Amendment [Member] | Greater than or equal to 3.50 to 1.00 but less than 4.00 to 1.00 [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Minimum Cash	50,000,000.00
Credit Agreement February 2016 Amendment [Member] | Less than 3.50 to 1.00 [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Minimum Cash	$ 0.00