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Summary of Significant Accounting Policies - Restructuring Charges (Details) (Office Closure [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Office Closure [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 4.7

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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