Goodwill and Other Intangible Assets (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Goodwill and other intangible assets:
In-process research & development	$ 820,000	$ 820,000
Goodwill	35,156,000	35,156,000
Gross Carrying Amount, Total	119,589,000	119,589,000
Accumulated Amortization	(37,828,000)	(36,075,000)
Customer lists/relationships [Member]
Goodwill and other intangible assets:
Gross Carrying Amount	62,014,000	62,014,000
Accumulated Amortization	(26,015,000)	(25,084,000)
Patents [Member]
Goodwill and other intangible assets:
Gross Carrying Amount	10,319,000	10,319,000
Accumulated Amortization	(10,319,000)	(10,319,000)
Other intangibles [Member]
Goodwill and other intangible assets:
Gross Carrying Amount	11,280,000	11,280,000
Accumulated Amortization	(1,494,000)	(672,000)
Total definite lived intangible assets [Member]
Goodwill and other intangible assets:
Gross Carrying Amount	83,613,000	83,613,000
Accumulated Amortization	(37,828,000)	(36,075,000)
Goodwill [Member]
Goodwill and other intangible assets:
Goodwill	$ 35,156,000	$ 35,156,000