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Labor Union Contracts	9 Months Ended
Labor Union Contracts	Sep. 30, 2016
Labor Union Contracts [Abstract]
Concentration risk disclosure	Labor Union Contracts Over 37% of our employees are members of various bargaining units represented by the Communication Workers of America and the International Brotherhood of Electrical Workers. Approximately 11,000, or 26%, of our employees are subject to collective bargaining agreements that are scheduled to expire October 7, 2017.