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Related Party Transactions (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Related Party Transactions [Line Items]        
Net revenues from related parties $ 6,407 $ 6,475 $ 19,619 $ 21,689
Related Party Transaction, Selling, General and Administrative Expenses $ 972 $ 928 $ 3,190 $ 2,477
Majority Shareholder [Member]        
Related Party Transactions [Line Items]        
Aggregate voting power held by related party 66.00%   66.00%  
Majority Shareholder [Member] | Common Class B [Member]        
Related Party Transactions [Line Items]        
Percentage of common stock owned by related party 100.00%   100.00%  
Maximum [Member] | Majority Shareholder [Member] | Common Class A [Member]        
Related Party Transactions [Line Items]        
Percentage of common stock owned by related party 2.00%   2.00%