Annual report pursuant to Section 13 and 15(d)

Net Property and Equipment (Narrative) (Details)

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Net Property and Equipment (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]      
Cash payment $ 19,700 $ 0 $ 0
Fair Market Value of IRU Capacity 14,000    
Other Income (Expense) [Member]      
Property, Plant and Equipment [Line Items]      
Gain from adjustment to fair value $ 3,100