Annual report pursuant to Section 13 and 15(d)

Software Impairment Software Impairment (Narrative) (Details)

v3.3.1.900
Software Impairment Software Impairment (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Software impairment charge $ 29,839,000 $ 0 $ 0
Wireless, Internet, Video, Local Service, and Long Distance Customer Billing Systems [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Fair Value of Future Capital Expenditures 0    
Software impairment charge 20,700,000    
Internally Developed Machine-To-Machine Billing System [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Software impairment charge 7,100,000    
User Management Software [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Software impairment charge $ 1,000,000