Commitments and Contingencies (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Class of Warrant or Right [Line Items]
Unrecorded Unconditional Purchase Obligation, Maximum	$ 5,100,000
Movement in Standard Product Warranty Accrual [Roll Forward]
Warranty liability balance, beginning of the year	3,954,000	3,438,000
Product warranty accruals	3,131,000	5,332,000
Adjustments for payments made	(3,757,000)	(4,816,000)
Warranty liability balance, end of the year	3,328,000	3,954,000
Warranty Reserves [Member]
Class of Warrant or Right [Line Items]
Accrued warranty reserve	2,599,000	3,148,000
Warranty Reserves [Member]
Class of Warrant or Right [Line Items]
Accrued warranty reserve	$ 729,000	$ 806,000