Basis of Presentation Basis of Presentation (Policies)

6 Months Ended

Jun. 30, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Revenue-Based Taxes

Revenue-Based Taxes. We record certain revenue-based taxes and other excise taxes on a gross basis as a component of both service and other revenues and selling, general and administrative expenses in our condensed consolidated financial statements. For the three and six months ended June 30, 2016, we recognized $11.5 million and $25.3 million, respectively, in revenue-based taxes and other excise taxes, respectively. For the three and six months ended June 30, 2015, we recognized $18.7 million and $39.0 million, respectively, in revenue-based taxes and other excise taxes, respectively.

Diluted Net (Loss) Income Per Common Share

Diluted Net (Loss) Income Per Common Share. As presented for the three and six months ended June 30, 2016, our calculation of diluted net loss from continuing operations per common share is based on the weighted average number of common shares outstanding during those periods and does not include other potential common shares, including shares issuable upon the potential exercise of stock options under our stock-based employee compensation plans or restricted common shares issued under those plans since their effect would have been antidilutive. As presented for the three and six months ended June 30, 2015, our calculation of diluted net income from continuing operations per common share includes 0.2 million and 0.3 million restricted common shares, respectively, but does not include any other potential common shares, including shares issuable upon the potential exercise of stock options issued under our stock-based compensation plans since their effect would have been antidilutive.

For both the three and six months ended June 30, 2016, we did not include 3.6 million stock options in our calculation of diluted net loss from continuing operations per common share because their effect would have been antidilutive. For the three and six months ended June 30, 2016, we did not include 0.8 million and 0.9 million restricted common shares, respectively, in our calculation of diluted net loss from continuing operations per common share because their effect would have been antidilutive. In addition, for the three and six months ended June 30, 2015, we did not include 4.1 million and 4.8 million stock options, respectively, in our calculation of diluted net income from continuing operations per common share because their effect would have been antidilutive.