Corporate Debt (Schedule Of Corporate Debt Principal Maturities) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Long-term Debt, Total	$ 357,111	$ 383,992
Senior Notes [Member]
Debt Instrument [Line Items]
Thereafter	325,000
Long-term Debt, Total	325,000
Non Recourse Debt [Member]
Debt Instrument [Line Items]
2013	2,038
2014	8,506
2015	20,588
2016	979
Long-term Debt, Total	$ 32,111