Guarantor Disclosures (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	1 Months Ended	12 Months Ended
	Jan. 31, 2006	Dec. 31, 2011	Dec. 31, 2010	Jan. 13, 2006
Condensed Financial Statements, Captions [Line Items]
Maturity		2016
Ownership interest in guarantor subsidiaries		100.00%
6 5/8% Senior Notes Due 2016 [Member]
Condensed Financial Statements, Captions [Line Items]
Stated interest rate		6.625%	6.625%	6.625%
Maturity	2016	2016
Minimum debt amount guaranteed by subsidiaries		$ 5,000