Labor Union Contracts	3 Months Ended
Mar. 31, 2021
Risks and Uncertainties [Abstract]
Labor Union Contracts	Labor Union ContractsAs of March 31, 2021, approximately, 23% of our employees were represented by the Communication Workers of America ("CWA") or the International Brotherhood of Electrical Workers ("IBEW"). Approximately 4% of our union-represented employees were subject to collective bargaining agreements that expired as of March 31, 2021 and are currently being renegotiated. Approximately 10% of our represented employees are subject to collective bargaining agreements that are scheduled to expire over the 12 month period ending March 31, 2022.

The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-URI http://asc.fasb.org/topic&trid=2134479

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