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Retirement Benefit Plan	12 Months Ended
Retirement Benefit Plan	Dec. 31, 2019
Retirement Benefits [Abstract]
Retirement Benefit Plan	25. Retirement Benefit Plan Our 401(k) retirement plan provides for optional employee contributions up to the applicable Internal Revenue Service annual limit and discretionary employer matching contributions. Through June 2017 we made 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. Beginning July 2017, we make discretionary matching contributions to each participant’s account at a rate of 100% of each participant’s contributions up to 5% of eligible compensation. We recorded matching contributions of $6.8 million, $6.5 million and $4.8 million during the years ended December 31, 2019, 2018 and 2017, respectively.