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Liabilities, Noncurrent [Abstract] Expected Maturity of Lease Liabilities, Operating Lessee, Operating Lease, Liability, Maturity [Table Text Block] Revaluation of deferred tax liabilities Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount Entity Address, Address Line One Entity Address, Address Line One Payments for financing arrangements and other Proceeds from (Payments for) Other Financing Activities Product and Service [Axis] Product and Service [Axis] Finance lease, weighted average remaining lease term Finance Lease, Weighted Average Remaining Lease Term Employees Employees [Member] Employees Subsequent Event [Table] Subsequent Event [Table] Entity Tax Identification Number Entity Tax Identification Number Assets refund Indefinite-lived Intangible Assets Refund Indefinite-lived Intangible Assets Refund Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] External revenue Entity Wide Information Revenue From External Customer [Abstract] Reconciliation of Income Taxes Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Net (decrease) increase in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect State income tax (benefit) expense, net of federal tax effect Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Entity Central Index Key Entity Central Index Key Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Other current liabilities Other Accrued Liabilities, Current City Area Code City Area Code ASSETS Assets [Abstract] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Income tax expense Discontinued Operation, Tax Effect of Income (Loss) from Discontinued Operation During Phase-out Period Expected tax (benefit) expense at federal statutory Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Commercial Fiber Commercial Fiber [Member] Commercial Fiber Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Less: Interest Finance Lease, Liability, Undiscounted Excess Amount Other liabilities Other liabilities Other Liabilities, Noncurrent Leases Lessor, Operating Leases [Text Block] Number of wireless sites Long-Lived Assets, Number Of Wireless Sites Long-Lived Assets, Number Of Wireless Sites Continuing Operations Continuing Operations [Member] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Capital expenditures Payments to Acquire Property, Plant, and Equipment Plant under construction Asset under Construction [Member] Equity method investments Equity Method Investment, Aggregate Cost Right-of-use asset obtained in exchange for operating lease liability Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Effective Income Tax Rate Reconciliation, Amount [Abstract] Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] Service revenue and other [Member] Service revenue and other