Leasing Arrangements (Details) (USD $)	12 Months Ended					12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jul. 27, 2010 Somerset, NJ Manufacturing Facility [Member] Period sqft	Dec. 01, 2012 Vernon Hills, IL Research and Development Center [Member]	Dec. 31, 2013 EJ Financial Enterprises, Inc [Member]	Mar. 03, 2010 EJ Financial Enterprises, Inc [Member]
Leasing Arrangements [Abstract]
Rental expense	$ 2,900,000	$ 2,300,000	$ 2,400,000
Period of operating leases	10 years
Renewal period for operating leases	5 years
Future minimum rental payments under non-cancelable operating and capital leases [Abstract]
2014	1,973,000
2015	1,970,000
2016	2,000,000
2017	1,791,000
2018	529,000
2019 and thereafter	340,000
Total	8,603,000
Somerset , NJ manufacturing facility [Abstract]
Period of building lease agreement				7 years
Area of manufacturing facility				50,000
Base rent per month under lease agreement				38,801
Number of additional five years lease renewal periods				4
Notice period for renewal of lease before termination or renewal				6 months
Vernon Hills, IL R&D Center [Abstract]
Base rent commitment for lease agreement					1,324,000
Sub-lease with EJ Financial [Abstract]
Period term of sub-lease agreement							8 years
Sublease rentals						$ 240,000