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Legal Contingencies	6 Months Ended
Legal Contingencies	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Legal Contingencies	(7) Legal Contingencies The nature of our potential exposure to legal contingencies is described in our 2016 annual report on Form 10-K in Note 9 of the Notes to Consolidated Financial Statements. As of June 30, 2017, there were no litigation matters that we consider to be probable or reasonably possible to have a material adverse outcome.