Debt Obligations (Outstanding Unsecured Notes in Series of Transactions) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Schedule of principal payments of debt obligations
Repurchase Amount	$ 31,296
Principal	29,250
Loss	(2,119)
Deferred Financing Amortization	40
Note Four [Member]
Schedule of principal payments of debt obligations
Repurchase Amount	20,822
Principal	19,830
Loss	(1,020)
Deferred Financing Amortization	16
Note Five [Member]
Schedule of principal payments of debt obligations
Repurchase Amount	9,902
Principal	8,910
Loss	(1,036)
Deferred Financing Amortization	23
Note Six [Member]
Schedule of principal payments of debt obligations
Repurchase Amount	572
Principal	510
Loss	(63)
Deferred Financing Amortization	$ 1
2012 5.750% Notes [Member]
Schedule of principal payments of debt obligations
Debt instrument stated interest rate	5.75%
2014 5.400% Notes
Schedule of principal payments of debt obligations
Debt instrument stated interest rate	5.40%
2015 7.500% Notes [Member]
Schedule of principal payments of debt obligations
Debt instrument stated interest rate	7.50%