Corporate Debt (Schedule Of Corporate Debt) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Long-term Debt, Total	$ 325,000	$ 383,992
Stated interest rate	6.70%
Long-term Debt	325,000	383,992
Senior notes 6.70%, due 2022 [Member]
Debt Instrument [Line Items]
Long-term Debt, Total	175,000	175,000
Stated interest rate	6.70%
Debt instrument, maturity date	Jan. 01, 2022
Redemption price, percentage of principal amount	100.00%
Long-term Debt	175,000	175,000
Senior notes 5.375%, due 2022 [Member]
Debt Instrument [Line Items]
Long-term Debt, Total	150,000	150,000
Due date	December 2022
Stated interest rate	5.375%
Redemption price, percentage of principal amount	100.00%
Long-term Debt	150,000	150,000
Non-recourse debt, 6.75%, due 2016 [Member]
Debt Instrument [Line Items]
Long-term Debt, Total		58,992
Long-term Debt		$ 58,992