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Labor Union Contracts	6 Months Ended
Labor Union Contracts	Jun. 30, 2019
Risks and Uncertainties [Abstract]
Labor Union Contracts	Labor Union Contracts As of June 30, 2019, approximately 43% of our employees were represented by the Communication Workers of America or the International Brotherhood of Electrical Workers. We believe relations with our employees continue to be generally good. Approximately 7,900, or 100%, of our union-represented employees are subject to collective bargaining agreements that are scheduled to expire over the next 12 months.