Warrany Costs Warranty Schedule (Details) (USD $)	6 Months Ended
	Jun. 30, 2013
Accrued Liabilities, Current [Abstract]
Loss Contingency Accrual, at Carrying Value	$ 3,800,000
Balance as of January 1	21,451,000
Warranties provided during the period	5,569,000
Settlements made during the period	(6,263,000)
Changes in liability for pre-existing warranties during the period, including expirations	4,303,000
Balance as of June 30	$ 25,060,000