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Labor Union Contracts	9 Months Ended
Labor Union Contracts	Sep. 30, 2018
Labor Union Contracts [Abstract]
Labor Union Contracts	Labor Union Contracts As of September 30, 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 300 (less than 1%) of our employees were subject to collective bargaining agreements that have expired as of September 30, 2018 and are currently being renegotiated.