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Acquisitions (Details) (USD $)	3 Months Ended	1 Months Ended		3 Months Ended
	Mar. 31, 2012	Feb. 29, 2012 Unity Y	Feb. 03, 2012 Unity	Mar. 31, 2012 Other business acquisitions Y business
Business acquisitions
Cash			$ 31,300,000
Consideration amount due in the future	1,050,000			1,000,000
Cash deposited into escrow account			5,500,000
Related transaction costs			600,000
Retention bonus payable to Unity Employees			5,000,000
Retention bonus payable to Unity employees (in years)		3
Cash			182,000
Property and equipment			51,000
Other tangible assets			36,000	1,000,000
Identified intangible assets			19,280,000	3,700,000
Goodwill			15,451,000	8,100,000
Total purchase price			$ 35,000,000	$ 12,800,000
Estimated Useful Life (in years)		10		6
Number of businesses acquired				1

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The amount of acquisition cost of a business combination allocated to other assets of the acquired entity.

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The calculated weighted-average amortization period of a major class of finite-lived intangible assets acquired during the current period either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

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Amount of cash paid to acquire the entity.

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The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

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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 acquisition cost of a business combination allocated to an identifiable intangible asset that will be amortized.

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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 number of businesses acquired by the entity during the period.

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