Labor Union Contracts

3 Months Ended

Mar. 31, 2017

Labor Union Contracts [Abstract]

Concentration risk disclosure

Labor Union Contracts

Approximately 37% of our employees are members of various bargaining units represented by the Communication Workers of America and the International Brotherhood of Electrical Workers. Approximately 12,000, or 30%, of our employees are subject to collective bargaining agreements that are scheduled to expire during the remainder of 2017, including approximately 10,000, or 25%, of our employees that are subject to collective bargaining agreements that are scheduled to expire October 7, 2017.