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Asset Dispositions (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Jul. 17, 2017
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]          
Gain on disposal     $ 174,984 $ 0  
Reclassification of foreign currency translation loss to investment, net of tax $ 31,381 $ 0 $ 31,381 $ 0  
NexTraq | Held-for-sale          
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]          
Consideration         $ 316,000
Gain on disposal 175,000        
Tax effect of gain from disposal $ 65,800        
Masternaut          
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]          
Ownership percentage 44.00%   44.00%    
Impairment of equity method investment $ 44,600        
Reclassification of foreign currency translation loss to investment, net of tax $ 31,400