Debt (Terms Of The Senior Credit Agreement) (Narrative) (Details) - Senior Credit Agreement [Member]	12 Months Ended
Dec. 31, 2016
Debt Instrument [Line Items]
Debt to annualized borrower EBITDA ratio	6.5
Debt and net hedge exposure to annualized borrower EBITDA	6.5
Consecutive trading days	30 days
Annualized borrower EBITDA to annualized cash interest expense	2.0

Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instruments must exceed threshold percentage for a specified number of trading days to trigger conversion feature, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration