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CONSOLIDATED STATEMENTS OF INCOME (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CONSOLIDATED STATEMENTS OF INCOME
Compensation and related costs, share-based compensation	$ 54,144wdr_ShareBasedCompensationExpense	$ 53,179wdr_ShareBasedCompensationExpense	$ 48,748wdr_ShareBasedCompensationExpense
Loss from discontinued operations, tax expense	$ 0	$ 0	$ 1,058

Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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