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Restructuring Charges (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended
	Mar. 31, 2012 employee	Dec. 31, 2013 employee	Dec. 31, 2012
Restructuring Charges [Abstract]
Reduction in workforce, full-time employees	11	175
Number of full-time employees		650dei_EntityNumberOfEmployees
Severance costs		$ 1.2us-gaap_SeveranceCosts1	$ 1.1us-gaap_SeveranceCosts1

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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