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Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2017
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions In May 2001, the Company entered into a $26.5 million loan agreement with Warren V. Musser, a former Chairman and Chief Executive Officer of the Company. Through December 31, 2017, the Company recognized impairment charges against the loan of $15.7 million. Since 2001 and through December 31, 2017, the Company has received a total of $17.1 million in payments on the loan. The carrying value of the loan at December 31, 2017 was zero. The Company received payments of $0.1 million on this loan agreement in the year ended December 31, 2016 and did not receive any payments on this loan agreement in the years ended December 31, 2017 or 2015. In the normal course of business, the Company’s officers and employees hold board positions with partner and other companies in which the Company has a direct or indirect ownership interest.