Commitments And Contingencies (Tables)

3 Months Ended

Mar. 31, 2012

Commitments And Contingencies [Abstract]

Reconciliation Of Warranty Reserves

Balance of deferred amounts at January 1, 2012	$	37,113
Warranty costs incurred including payments		(565	)
Accruals relating to pre-existing contracts (including changes in estimates)		37
Balance of deferred amounts at March 31, 2012	$	36,585