Annual report pursuant to Section 13 and 15(d)

Property and Equipment - Additional Information (Details)

v3.8.0.1
Property and Equipment - Additional Information (Details)
12 Months Ended
Dec. 31, 2017
USD ($)
satellite
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Property, Plant and Equipment [Line Items]      
Asset impairment charges $ 0 $ 0 $ 0
Depreciation and amortization expense on property and equipment 261,147,000 220,434,000 220,514,000
Disposal of property and equipment 78,559,000 843,129,000 43,833,000
Loss on disposal of assets 0 12,912,000 7,384,000
Capitalized interest costs $ 4,948,000 419,000 $ 0
Number of owned satellites | satellite 5    
Satellite system      
Property, Plant and Equipment [Line Items]      
Disposal of property and equipment   $ 801,206,000