Indebtedness (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
Repurchased and retired senior unsecured notes prior to maturity
Principal Amount Repurchased	$ 430
Purchase Price	406
2028 Notes [Member]
Repurchased and retired senior unsecured notes prior to maturity
Principal Amount Repurchased	430
Purchase Price	$ 406