Restructuring Charges - Schedule of Restructuring Activities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
Dec. 31, 2012	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Restructuring Reserve [Roll Forward]
Asset impairment		$ 300
Restructuring charges, net	6,200	6,435	875	532
December 2012 Restructuring Program [Member]
Restructuring Reserve [Roll Forward]
Liability, Beginning of Period		0	0
Restructuring charges, net		6,435	913
Restructuring Reserve, Settled with Cash		(1,168)	(875)
Restructuring Reserve, Accrual Adjustment		(4,719)	(38)
Liability, End of Period		548	0
December 2012 Restructuring Program [Member] \| Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Liability, Beginning of Period		0	0
Workforce costs		1,716	913
Restructuring Reserve, Settled with Cash		(1,168)	(875)
Restructuring Reserve, Accrual Adjustment		0	(38)
Liability, End of Period		548	0
December 2012 Restructuring Program [Member] \| Impairment of Intangible Assets [Member]
Restructuring Reserve [Roll Forward]
Liability, Beginning of Period		0	0
Asset impairment		4,719	0
Restructuring Reserve, Settled with Cash		0	0
Restructuring Reserve, Accrual Adjustment		(4,719)	0
Liability, End of Period		$ 0	$ 0

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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Amount of any reversal and other adjustment made during the period to the amount of a previously accrued liability for a specified type of restructuring cost, excluding adjustments for costs incurred during the period, costs settled during the period, and foreign currency translation adjustments.

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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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- Definition

The charge against earnings in the period for known and estimated costs of termination benefits provided to current employees that are involuntarily terminated under a benefit arrangement associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding costs or losses pertaining to an entity newly acquired in a business combination or a discontinued operation as defined by generally accepted accounting principles and costs associated with one-time termination benefits.

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