Commitments and Contingencies (Details 2) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Insurance reserves RHIC	Mar. 31, 2012 Insurance reserves RHIC	Mar. 31, 2013 Legal reserves	Dec. 31, 2012 Legal reserves
Changes in the entity's loan loss and related legal reserves
Balance at the beginning of the period	$ 10,484,000	$ 10,141,000
Provision for losses	543,000	(12,000)
Settlements made	(46,000)	(345,000)
Balance at the end of the period	10,981,000	9,784,000
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	18,188,000	20,648,000
Warranties issued	1,056,000	707,000
Changes in liability for accruals related to pre-existing warranties	393,000	207,000
Settlements made	(1,249,000)	(1,837,000)
Balance at the end of the period	18,388,000	19,725,000
Changes in entity's subcontractor insurance reserves
Balance at the beginning of period			14,813,000	18,209,000
Insurance expense provisions or adjustments			0	0
Loss expenses paid			(483,000)	(448,000)
Balance at the end of period			14,330,000	17,761,000
Changes in entity's legal reserves
Legal reserves					18,100,000	17,900,000
Reasonably possible losses in excess of amounts accrued					$ 13,000,000