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Summary of Significant Accounting Policies - Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Contract Assets      
Balance at beginning of period $ 30,116 $ 30,116  
Change due to acquisitions   2,815  
Change due to conditional versus unconditional   7,057  
Reclassified to unbilled accounts receivable   (28,980)  
Balance at June 30, 2018   11,008  
Contract Liabilities      
Balance at beginning of period 106,005 106,005  
Change due to acquisitions   7,465  
Change in timing for performance obligation to be satisfied   17,682  
Balance at June 30, 2018   131,152  
Increase (Decrease) In Income Taxes Abstract      
Decrease in the provision for income taxes $ 2,800    
Revenue related to our contract liabilities   $ 99,800  
The term of the renewable service maintenance agreements (in years)   1 year  
Practical Expedient   true  
Calculated under Revenue Guidance in Effect before Topic 606 [Member]      
Increase (Decrease) In Income Taxes Abstract      
Revenue related to our contract liabilities     $ 84,500