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Employee Benefit Plans	12 Months Ended
	Dec. 31, 2018
Retirement Benefits [Abstract]
Employee Benefit Plans	Employee Benefit Plans We maintain a qualified defined contribution 401(k) plan, which covers substantially all of our U.S. employees. Under the plan, participants are entitled to make pre-tax and/or Roth post-tax contributions up to the annual maximums established by the Internal Revenue Service. We match a certain percentage of participant contributions pursuant to the terms of the plan, which contributions are limited to a percentage of the participant’s eligible compensation. Effective in 2018, we increased our matching percentage. We made contributions related to the plan of $15.2 million, $11.6 million and $11.4 million during the years ended December 31, 2018, 2017 and 2016, respectively. We also maintain several defined contribution pension plans for our employees in the United Kingdom and other foreign countries. We contributed to these plans $7.7 million, $6.4 million and $6.3 million during the years ended December 31, 2018, 2017 and 2016, 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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-URI http://asc.fasb.org/topic&trid=2228938

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 712
-URI http://asc.fasb.org/topic&trid=2197446

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-URI http://asc.fasb.org/topic&trid=2127225

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-URI http://asc.fasb.org/topic&trid=2235017

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- References

No definition available.

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