Warranty (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 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	3,686,000	4,832,000	4,832,000
Accrual for warranties during the period, net	946,000	487,000
Actual costs incurred	(883,000)	(690,000)
Balance at end of period	$ 3,749,000	$ 4,629,000	$ 3,686,000
Minimum [Member]
Product Warranties
Product Warranty Period	30 days
Maximum [Member]
Product Warranties
Product Warranty Period	3 years