Warranty (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Contingencies
Amount requested by LFR for damage					$ 135,000,000
Payments to LRF for the past three years					400,000,000
Activity related to the product warranty liability
Balance at beginning of period	3,749,000	4,629,000	3,686,000	4,832,000	4,832,000
Accrual for warranties during the period, net	899,000	301,000	1,845,000	788,000
Actual costs incurred	(896,000)	(859,000)	(1,779,000)	(1,549,000)
Balance at end of period	$ 3,752,000	$ 4,071,000	$ 3,752,000	$ 4,071,000	$ 3,686,000
Minimum [Member]
Product Warranties
Product Warranty Period			30 days
Maximum
Product Warranties
Product Warranty Period			3 years