Commitments and Contingencies (Details 2) (USD $)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Insurance reserves RHIC	Jun. 30, 2011 Insurance reserves RHIC	Jun. 30, 2012 Legal reserves	Dec. 31, 2011 Legal reserves
Changes in the entity's loan loss and related legal reserves
Balance at the beginning of the period	$ 10,141,000	$ 8,934,000
Provision for losses	71,000	(18,000)
Settlements made	(345,000)	(140,000)
Balance at the end of the period	9,867,000	8,776,000
Product warranty
Number of years of product warranty for workmanship and materials	1 year
Number of years of product warranty for mechanical systems	2 years
Number of years of product warranty for structural systems	10 years
Product liability reserves
Balance at the beginning of the period	20,648,000	20,112,000
Warranties issued	1,283,000	1,275,000
Changes in liability for accruals related to pre-existing warranties	1,351,000	706,000
Settlements made	(4,184,000)	(2,784,000)
Balance at the end of the period	19,098,000	19,309,000
Changes in entity's subcontractor insurance reserves
Balance at the beginning of period			18,209,000	21,141,000
Insurance expense provisions or adjustments			0	0
Loss expenses paid			(1,043,000)	(967,000)
Balance at the end of period			17,166,000	20,174,000
Changes in entity's legal reserves
Legal reserves					$ 17,200,000	$ 16,500,000