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ACQUISITIONS - CastleLine (Details) - USD ($)
shares in Thousands, $ in Thousands
12 Months Ended
Jul. 17, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jun. 30, 2016
Acquisitions          
Value of common stock paid at acquisition   $ 0 $ 21,733 $ 0  
Goodwill   $ 86,283 $ 82,801 $ 90,851  
CastleLine          
Acquisitions          
Cash paid at acquisition $ 12,300        
Accounts payable $ 10,500        
Contingent consideration arrangements, payment period 4 years        
Number of shares exchanged for acquisition 495        
Value of common stock paid at acquisition $ 14,400        
Additional consideration 3,800        
Cash         $ 1,088
Accounts receivable, net         100
Prepaid expenses         20
Restricted cash         2,501
Non-compete agreements         1,130
Databases/other         1,800
Customer relationships         395
Trademarks and trade names         160
Deferred taxes         356
Goodwill         26,730
Assets acquired         34,280
Accounts payable and accrued expenses         (837)
Deferred revenue         0
Purchase price         33,443
CastleLine | Initial purchase price allocation          
Acquisitions          
Business combination, consideration transferred 33,400        
Cash 1,088        
Accounts receivable, net 510        
Prepaid expenses 66        
Restricted cash 2,501        
Non-compete agreements 1,105        
Databases/other 465        
Customer relationships 395        
Trademarks and trade names 150        
Deferred taxes 0        
Goodwill 28,125        
Assets acquired 34,405        
Accounts payable and accrued expenses (875)        
Deferred revenue (87)        
Purchase price $ 33,443        
CastleLine | Adjustments          
Acquisitions          
Cash         0
Accounts receivable, net         (410)
Prepaid expenses         (46)
Restricted cash         0
Non-compete agreements         25
Databases/other         1,335
Customer relationships         0
Trademarks and trade names         10
Deferred taxes         356
Goodwill         (1,395)
Assets acquired         (125)
Accounts payable and accrued expenses         38
Deferred revenue         87
Purchase price         $ 0