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Related Party Transactions	3 Months Ended
Related Party Transactions	Mar. 31, 2018
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions During the three month periods ended March 31, 2018 and 2017, the Company obtained legal services totaling $0.6 million and $0.5 million, of which $0.5 million and $0.3 million was payable as of March 31, 2018 and 2017, respectively, to Polsinelli PC, a law firm for which the spouse of the Company’s Executive Vice President, General Counsel and Secretary is an attorney and shareholder. The Company also obtained and paid legal services totaling $0.2 million and $0.1 million, during the three month periods ended March 31, 2018 and 2017, respectively, to Segal McCambridge Singer & Mahoney, a firm for which the brother in law of the Company's Executive Vice President, General Counsel and Secretary is a partner.