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Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2017
Related Party Transactions [Abstract]
Related Party Transactions	NOTE 10. RELATED PARTY TRANSACTIONS Other Arrangements As of December 31, 2017 and December 31, 2016, approximately $81.8 million and $81.6 million, respectively, of the aggregate principal amount of our Term Facility was owned by affiliates of Blackstone. We make periodic interest and principal payments on such debt in accordance with its terms. We engaged Blackstone Advisory Partners L.P., an affiliate of Blackstone, to provide certain financial consulting services in connection with the public offering of our common stock by certain stockholders in April 2015 for a fee of approximately $0.4 million. We also purchase products and services from entities affiliated with or owned by Blackstone. The fees paid for these products and services were approximately $3.3 million, $4.9 million and $2.6 million during years ended December 31, 2017, 2016, and 2015, respectively.