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Acquisition and Disposition (Details 2) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Mar. 16, 2015
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Assets and liabilities assumed          
Goodwill   $ 69,699 $ 0 $ 34,510 $ 69,699
Reconciliation of accrued earnout consideration          
Interest accretion on contingent consideration     4,162 2,430 2,337
Adjustments to fair value of contingent consideration     0 7,018 $ 0
3Q Digital Inc          
Total consideration          
Cash consideration per purchase agreement $ 30,245        
Estimated fair value of contingent consideration 17,940        
Identifiable intangible assets and goodwill 48,185        
Assets and liabilities assumed          
Current assets 4,135        
Property and equipment 164        
Other assets 389        
Current liabilities (822)        
Other liabilities 0        
Total tangible assets and liabilities: 3,866        
Identifiable intangible assets 4,773        
Goodwill 41,845        
Total 50,484        
Level 3 | Contingent consideration | 3Q Digital Inc          
Reconciliation of accrued earnout consideration          
Contingent consideration at beginning of period   20,277 29,725    
Interest accretion on contingent consideration   $ 2,430 4,162    
Adjustments to fair value of contingent consideration     7,018    
Contingent consideration at end of period $ 20,277   $ 33,887 $ 29,725