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Labor Union Contracts	3 Months Ended
Labor Union Contracts	Mar. 31, 2019
Risks and Uncertainties [Abstract]
Labor Union Contracts	Labor Union Contracts As of March 31, 2019, 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 80 of our employees were subject to collective bargaining agreements that expired on or prior to March 31, 2019 and are currently being renegotiated. Approximately 6% of our union employees are subject to collective bargaining agreements that are scheduled to expire in 2019.