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Indebtedness (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Repurchased And Retired Senior Unsecured Notes Prior To Maturity
Principal Amount Repurchased	$ 112,757	$ 264,796
Purchase Price	110,667	265,858
2011 Notes [Member]
Repurchased And Retired Senior Unsecured Notes Prior To Maturity
Principal Amount Repurchased		143,498
Purchase Price		147,723
2011 Exchangeable Notes [Member]
Repurchased And Retired Senior Unsecured Notes Prior To Maturity
Principal Amount Repurchased		18,000
Purchase Price		17,936
2012 Notes [Member]
Repurchased And Retired Senior Unsecured Notes Prior To Maturity
Principal Amount Repurchased		82,236
Purchase Price		82,235
2014 Notes [Member]
Repurchased And Retired Senior Unsecured Notes Prior To Maturity
Principal Amount Repurchased	1,144	21,062
Purchase Price	1,143	17,964
2016 Notes [Member]
Repurchased And Retired Senior Unsecured Notes Prior To Maturity
Principal Amount Repurchased	500
Purchase Price	475
2017 Notes [Member]
Repurchased And Retired Senior Unsecured Notes Prior To Maturity
Principal Amount Repurchased	27,619
Purchase Price	27,506
2017 II Notes [Member]
Repurchased And Retired Senior Unsecured Notes Prior To Maturity
Principal Amount Repurchased	10,969
Purchase Price	10,182
2027 Notes [Member]
Repurchased And Retired Senior Unsecured Notes Prior To Maturity
Principal Amount Repurchased	7,500
Purchase Price	7,500
2028 Notes [Member]
Repurchased And Retired Senior Unsecured Notes Prior To Maturity
Principal Amount Repurchased	65,025
Purchase Price	$ 63,861