Income Taxes	3 Months Ended
Mar. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company recorded tax benefit on the pre-tax net loss for the three months ended March 31, 2017 of $0.0 million and tax expense on the pre-tax net income for the three months ended March 31, 2016 of $8.0 million, which equates to an effective tax rate of 0.0% and 30.1%, respectively, by applying the projected full year effective rate. For 2017, the statutory federal income tax is a benefit due to the pre-tax net loss; the projected annual effective tax rate differs from the 35% federal statutory rate primarily due to a benefit for state taxes offset by a tax expense associated with an increase in the valuation allowance. For 2016, the projected annual effective tax rate differs from the 35% federal statutory rate primarily due to a tax benefit associated with a decrease in the valuation allowance offset by state tax expense. Deferred Income Taxes At March 31, 2017, the Company had gross federal NOL carryforwards of $290.5 million. The Company's remaining federal NOL carryforwards will expire from 2019 to 2037. At March 31, 2017, the Company had a net, after attribute reduction, state NOL deferred tax asset of $11.5 million. The Company's remaining state NOL carryforwards will expire from 2018 to 2037. At March 31, 2017, the Company had a negligible alternative minimum tax credit carryover and had $4.3 million in state credit carryovers. Telecom Group completed an initial public offering on February 8, 2005, which resulted in an "ownership change" within the meaning of the United States of America federal income tax laws addressing NOL carryforwards, alternative minimum tax credits and other similar tax attributes. The Spinco Merger and the Company's emergence from Chapter 11 protection also resulted in ownership changes. As a result of these ownership changes, there are specific limitations on the Company's ability to use its NOL carryforwards and other tax attributes. The Company believes that it can use the NOLs even with these restrictions in place. Valuation Allowance. At March 31, 2017 and December 31, 2016, the Company established a valuation allowance against its deferred tax assets of $48.8 million and $41.5 million, respectively, which consists of a $39.4 million and $29.2 million federal allowance, respectively, and a $9.4 million and $12.3 million state allowance, respectively. Income Tax Returns The Company and its eligible subsidiaries file consolidated income tax returns in the United States of America federal jurisdiction and certain consolidated, combined and separate entity tax returns, as required, with various state and local governments. Based solely on statutes of limitations, the Company would not be subject to United States of America federal, state and local, or non-United States of America income tax examinations by tax authorities for years prior to 2012. However, tax years prior to 2012 may be subject to examination by federal or state taxing authorities if the Company's NOL carryovers from those years are utilized in the future. As of March 31, 2017 and December 31, 2016, the Company does not have any significant jurisdictional income tax audits.

Income Taxes

The Company recorded tax benefit on the pre-tax net loss for the three months ended March 31, 2017 of $0.0 million and tax expense on the pre-tax net income for the three months ended March 31, 2016 of $8.0 million, which equates to an effective tax rate of 0.0% and 30.1%, respectively, by applying the projected full year effective rate. For 2017, the statutory federal income tax is a benefit due to the pre-tax net loss; the projected annual effective tax rate differs from the 35% federal statutory rate primarily due to a benefit for state taxes offset by a tax expense associated with an increase in the valuation allowance. For 2016, the projected annual effective tax rate differs from the 35% federal statutory rate primarily due to a tax benefit associated with a decrease in the valuation allowance offset by state tax expense.

Deferred Income Taxes

At March 31, 2017, the Company had gross federal NOL carryforwards of $290.5 million. The Company's remaining federal NOL carryforwards will expire from 2019 to 2037. At March 31, 2017, the Company had a net, after attribute reduction, state NOL deferred tax asset of $11.5 million. The Company's remaining state NOL carryforwards will expire from 2018 to 2037. At March 31, 2017, the Company had a negligible alternative minimum tax credit carryover and had $4.3 million in state credit carryovers. Telecom Group completed an initial public offering on February 8, 2005, which resulted in an "ownership change" within the meaning of the United States of America federal income tax laws addressing NOL carryforwards, alternative minimum tax credits and other similar tax attributes. The Spinco Merger and the Company's emergence from Chapter 11 protection also resulted in ownership changes. As a result of these ownership changes, there are specific limitations on the Company's ability to use its NOL carryforwards and other tax attributes. The Company believes that it can use the NOLs even with these restrictions in place.

Valuation Allowance. At March 31, 2017 and December 31, 2016, the Company established a valuation allowance against its deferred tax assets of $48.8 million and $41.5 million, respectively, which consists of a $39.4 million and $29.2 million federal allowance, respectively, and a $9.4 million and $12.3 million state allowance, respectively.

Income Tax Returns

The Company and its eligible subsidiaries file consolidated income tax returns in the United States of America federal jurisdiction and certain consolidated, combined and separate entity tax returns, as required, with various state and local governments. Based solely on statutes of limitations, the Company would not be subject to United States of America federal, state and local, or non-United States of America income tax examinations by tax authorities for years prior to 2012. However, tax years prior to 2012 may be subject to examination by federal or state taxing authorities if the Company's NOL carryovers from those years are utilized in the future. As of March 31, 2017 and December 31, 2016, the Company does not have any significant jurisdictional income tax audits.