Commitments and Contingencies (Details) (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
Unrecorded Unconditional Purchase Obligation, Maximum	$ 4,400,000
Movement in Standard Product Warranty Accrual [Roll Forward]
Warranty liability balance, beginning of the period	3,328,000	3,954,000
Product warranty accruals	1,219,000	1,899,000
Utilization of accrual	(1,604,000)	(2,183,000)
Warranty liability balance, end of the period	2,943,000	3,670,000
Product Warranty Accrual, Current	2,300,000		2,600,000
Product Warranty Accrual, Noncurrent	$ 600,000		$ 700,000