Annual report pursuant to Section 13 and 15(d)

Industry Segments Data (Narrative) (Details)

v3.3.1.900
Industry Segments Data (Narrative) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
segment
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
customer
Segment Reporting Information [Line Items]      
Number of reportable segments | segment 2    
Percentage of long-lived assets not in US 82.00%    
Revenues $ 978,534 $ 910,198 $ 811,648
Number of Major Customers | customer     0
Wireless      
Segment Reporting Information [Line Items]      
Equipment subsidy 7,700 17,300 $ 12,200
Revenues 267,676 269,977 $ 197,218
Wireless and Wireline | Customer Concentration Risk | Sales Revenue, Net      
Segment Reporting Information [Line Items]      
Revenues $ 130,800 $ 108,300  
Concentration Risk, Percentage 13.00% 12.00%