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Disposition (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Feb. 28, 2018
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Mar. 16, 2015
Acquisitions          
Gain on sale   $ 30,954 $ 0    
Reconciliation of accrued earnout consideration          
Interest accretion on contingent consideration   742 $ 2,081    
3Q Digital Inc          
Acquisitions          
Contingent consideration, maximum potential payment         $ 35,000
3Q Digital Inc | Level 3 | Contingent Consideration          
Reconciliation of accrued earnout consideration          
Accrued contingent consideration at beginning of period   33,887      
Interest accretion on contingent consideration   742      
Disposition   (34,629)      
Accrued contingent consideration at end of period   0   $ 33,887  
3Q Digital Inc          
Acquisitions          
Proceeds from sale of business $ 5,000        
Additional proceeds for sale of business $ 5,000        
Disposal group percent of total revenue (less than) (as percent)       10.00%  
Gain on sale   $ 31,000