Equity Investments (Details 2)	12 Months Ended
	Dec. 31, 2012
Concord Debt Holdings LLC [Member]
Separate Financial Statements for Unconsolidated Subsidiaries [Abstract]
Determined significant years	2011
Sealy Northwest Atlanta Partners LP [Member]
Separate Financial Statements for Unconsolidated Subsidiaries [Abstract]
Determined significant years	2011
Sealy Newmarket General Partnership [Member]
Separate Financial Statements for Unconsolidated Subsidiaries [Abstract]
Determined significant years	2011