Acquisitions (Narrative) (Details) (USD $)	3 Months Ended	1 Months Ended	3 Months Ended	1 Months Ended
Sep. 30, 2011	Jul. 31, 2011 Aegis Lightwave, Inc. [Member]	Sep. 30, 2011 Aegis Lightwave, Inc. [Member]	Dec. 31, 2010 Max Levy Autograph, Inc. [Member]
Business Acquisition [Line Items]
Purchase of business	$ 46,141,000	$ 46,100,000		$ 12,800,000
Cash acquired		8,400,000
Goodwill		21,202,000		6,485,000
Fair value of accounts receivable acquired			4,600,000
Business acquisition purchase price allocation gross contractual amount of accounts receivable acquired			4,600,000
Deferred tax assets		9,976,000		171,000
Revenues			4,800,000
Net losses			400,000
Transaction costs attributable to acquisition		$ 900,000

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Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

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The amount of cash and cash equivalents acquired in a business combination.

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Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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