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Labor Union Contracts	6 Months Ended
Labor Union Contracts	Jun. 30, 2018
Labor Union Contracts [Abstract]
Labor Union Contracts	Labor Union Contracts As of June 30, 2018, approximately 28% 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. Less than 300 of our employees were subject to collective bargaining agreements that have expired as of June 30, 2018 and are currently being renegotiated. Approximately 1% of our employees are subject to collective bargaining agreements that are scheduled to expire in 2018.