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Acquisitions (Narrative) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Jan. 02, 2015
Business Acquisition [Line Items]      
Distributions to non-controlling interests   $ 179  
DMV [Member]      
Business Acquisition [Line Items]      
Business Acquisition, Percentage of Voting Interests Acquired     80.00%
Fiscal Year 2016 [Member]      
Business Acquisition [Line Items]      
Pro-rata distributions, percentage of free-cash-flow 50.00%    
Fiscal Year 2015 [Member]      
Business Acquisition [Line Items]      
Pro-rata distributions, percentage of free-cash-flow 100.00%    
DMV [Member]      
Business Acquisition [Line Items]      
Distributions to non-controlling interests   $ 163  
Purchase Of Remaining Percent [Member] | DMV [Member]      
Business Acquisition [Line Items]      
Business Acquisition, Effective Date of Acquisition Mar. 01, 2017    
Business Acquisition, Percentage of Voting Interests Acquired 20.00%    
Business Acquisition, Consideration Transferred $ 7,120    
Purchase Of Remaining Percent [Member] | Speakeasy [Member]      
Business Acquisition [Line Items]      
Business Acquisition, Effective Date of Acquisition Feb. 01, 2017    
Business Acquisition, Percentage of Voting Interests Acquired 30.00%    
Business Acquisition, Consideration Transferred $ 2,111