Supplemental Financial Information (Narrative) (Details)	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2013
Schedule Of Supplemental Financial Information [Line Items]
Ownership percentage	100.00%
Senior Subordinated 6.25% Notes
Schedule Of Supplemental Financial Information [Line Items]
Senior Subordinated Notes, interest rate	6.25%	6.25%	6.25%