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Retirement Benefit Plan	12 Months Ended
	Dec. 31, 2014
Retirement Benefit Plan
Retirement Benefit Plan	20.  Retirement Benefit Plan Our 401(k) retirement plan provides for optional employee contributions up to the Internal Revenue Service limit and discretionary employer matching contributions. We make discretionary matching contributions to each participant’s account at a rate of (i) 100% of each participant’s first 1% of contributions plus (ii) 50% of each participant’s contributions up to the next 5% of eligible compensation. We recorded matching contributions of $9.7 million, $8.2 million and $7.5 million during 2014, 2013 and 2012, respectively.

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- Definition

The entire disclosure for an entity's employee compensation and benefit plans, including, but not limited to, postemployment and postretirement benefit plans, defined benefit pension plans, defined contribution plans, non-qualified and supplemental benefit plans, deferred compensation, share-based compensation, life insurance, severance, health care, unemployment and other benefit plans.

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