Long-Term Debt (Maximum Secured Net Leverage Ratio Permitted) (Details) - Senior Credit Facility [Member]	Mar. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Secured net leverage ratio	383.00%	393.00%
Period from January 1, 2017 to June 30, 2017 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Secured net leverage ratio	450.00%
Period from July 1, 2017 to December 31, 2018 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Secured net leverage ratio	475.00%
Period from January 1, 2019 and thereafter [Member] | Maximum [Member]
Debt Instrument [Line Items]
Secured net leverage ratio	400.00%