Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Details)

v3.10.0.1
Summary of Significant Accounting Policies (Details) - USD ($)
shares in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
Dec. 31, 2015
Derivative Asset $ 0 $ 0      
Retained earnings 2,650,669,000 2,568,764,000      
Other current assets 1,471,000 2,797,000      
Deferred income tax liabilities 965,829,000 932,593,000      
Deferred revenue and other current liabilities 4,691,000 $ 5,168,000      
Deferred revenue current 4,300,000     $ 4,500,000  
Deferred revenue noncurrent 1,900,000     2,300,000  
Deferred revenue 6,200,000     6,800,000  
Revenue recognized $ 4,200,000        
Revenue recognized percentage 96.00%        
Practical expedient modified contract true        
Cumulative Effect of New Accounting Principle in Period of Adoption $ 10,729,000        
Basic WASO 181,325 181,772 152,103    
Potentially dilutive shares 1,264 1,374 749    
Diluted WASO 182,589 183,146 152,852    
Antidilutive shares excluded 10 0 17    
ASU 2016-09          
Cumulative Effect of New Accounting Principle in Period of Adoption   $ 17,361,000     $ 0
Excess Tax Benefit from Share-based Compensation, Operating Activities     $ 0    
ASU 2014-09          
Cumulative Effect of New Accounting Principle in Period of Adoption $ 1,223,000        
Minimum          
Revenue recognized period 1 year        
Maximum          
Revenue recognized period 3 years        
Adjustment | ASU 2014-09          
Retained earnings       1,200,000  
Other current assets       300,000  
Deferred income tax liabilities       400,000  
Deferred revenue and other current liabilities       $ (1,300,000)  
Skyhook | Significant customer | Revenue | Customer concentration          
Customer concentration (as a percent) 66.00% 57.00% 57.00%