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Labor Union Contracts	3 Months Ended
Labor Union Contracts	Mar. 31, 2018
Labor Union Contracts [Abstract]
Labor Union Contracts	Labor Union Contracts As of March 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. Less than 1,000 of our employees were subject to collective bargaining agreements that have expired as of March 31, 2018, and are being renegotiated.