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Labor Union Contracts	12 Months Ended
Labor Union Contracts	Dec. 31, 2019
Risks and Uncertainties [Abstract]
Labor Union Contracts	Labor Union Contracts As of December 31, 2019, approximately 25% of our employees were members of various bargaining units represented by the Communication Workers of America ("CWA") and the International Brotherhood of Electrical Workers ("IBEW"). We believe that relations with our employees continue to be generally good. There were no employees subject to collective bargaining agreements that expired prior to December 31, 2019. Approximately 9% of our represented employees are subject to collective bargaining agreements that are scheduled to expire in 2020.