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Labor Union Contracts	12 Months Ended
Labor Union Contracts	Dec. 31, 2018
Risks and Uncertainties [Abstract]
Labor Union Contracts	Labor Union Contracts As of December 31, 2018, approximately 26% 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. Approximately 1% of our employees were subject to collective bargaining agreements that expired prior to December 31, 2018 and are currently being renegotiated. Approximately 2% of our employees are subject to collective bargaining agreements that are scheduled to expire in 2019.