Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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Carrying amount as of the balance sheet date of known and estimated obligations associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid in the next twelve months or in the normal operating cycle if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

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- Definition

Carrying amount as of the balance sheet date of known and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid after one year or beyond the next operating cycle, if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

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- Definition

Amount of cash paid in the period to fully or partially settle a specified, previously accrued type of restructuring cost.

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Restructuring (Details) (USD $)	1 Months Ended	3 Months Ended
Restructuring (Details) (USD $)	Dec. 31, 2011	Mar. 31, 2012	Mar. 31, 2011
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Current	$ 3,430,000	$ 1,326,000
Restructuring and Related Cost, Number of Positions Eliminated	70
Restructuring Reserve [Roll Forward]
Beginning balance, December 31, 2011		3,900,000
Restructuring charge		60,000	0
Restructuring Reserve, Settled with Cash		(2,200,000)
Ending balance, March 31, 2012	3,900,000	1,800,000
Restructuring Reserve, Noncurrent		500,000
One-time Termination Benefits [Member]
Restructuring Reserve [Roll Forward]
Restructuring charge	4,200,000
Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Current		100,000
Restructuring Reserve [Roll Forward]
Beginning balance, December 31, 2011		600,000
Restructuring charge	700,000	0
Restructuring Reserve, Settled with Cash		0
Ending balance, March 31, 2012	600,000	600,000
Restructuring Reserve, Noncurrent		500,000
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Current		1,200,000
Restructuring Reserve [Roll Forward]
Beginning balance, December 31, 2011		3,300,000
Restructuring charge		100,000
Restructuring Reserve, Settled with Cash		(2,200,000)
Ending balance, March 31, 2012		1,200,000
Restructuring Reserve, Noncurrent		0
Non-Cash Stock-Based Compensation [Member]
Restructuring Reserve [Roll Forward]
Restructuring charge	$ 400,000