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Employee Benefit Plan	12 Months Ended
Employee Benefit Plan	Dec. 31, 2017
Retirement Benefits [Abstract]
Employee Benefit Plan	Employee Benefit Plan We offer the GP Retirement Savings Plan (the “Plan”) to our employees in the United States. Eligible employees are automatically enrolled unless they elect to not participate in the Plan, and contributions begin as soon as administratively feasible after enrollment. The Plan permits pre-tax contributions to the Plan by participants pursuant to Section 401(k) of the Internal Revenue Code (IRC). We make matching contributions at our discretion. In 2017, 2016 and 2015, we contributed 104,751, 111,326, and 91,301 shares, respectively, of our common stock directly to the Plan which had a value of approximately $2.7 million for each of the three years, and is recognized as compensation expense in the consolidated statements of operations for matching contributions to the Plan. We also maintain several defined contribution pension schemes for our employees in the United Kingdom and other foreign countries. We contributed to these plans $2.5 million, $2.2 million and $2.4 million during the years ended December 31, 2017, 2016 and 2015, respectively.