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Related Party Transactions	9 Months Ended
Related Party Transactions	Sep. 30, 2018
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Arrangements Involving the Company’s Executive Officers In January 2018, Christopher Cox, the Company’s executive vice president and chief corporate development officer, rejoined the law firm Cadwalader, Wickersham & Taft LLP (Cadwalader) as a partner. Mr. Cox remains employed with the Company and continues to lead certain company functions and initiatives, including corporate strategy, business development and investor relations. Stephen Rodin, the Company’s executive vice president, general counsel and secretary, has been, and will continue to be, responsible for the retention and management of outside counsel. Since 2015, the Company has retained Cadwalader as corporate and transactional legal counsel. The Company and Cadwalader have agreed on certain procedures to address potential conflicts that may arise out of Mr. Cox’s dual roles.