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Business Combinations (Purchase Price Allocation) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Apr. 30, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Goodwill $ 545,213   $ 530,249
Reeher [Member]      
Business Acquisition [Line Items]      
Net working capital, excluding deferred revenue   $ 1,683  
Property and equipment   755  
Finite-lived intangible assets   27,055  
Deferred tax asset   713  
Deferred revenue   (2,700)  
Goodwill   13,681  
Total purchase price   $ 41,187