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Related-Party Transactions (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Oct. 12, 2016
Dec. 31, 2015
Related Party Transaction [Line Items]            
Deferred compensation $ 26,744   $ 26,744     $ 25,493
Fair value of common stock 653   653     805
Deferred compensation expense $ 1,800 $ 90 $ 2,800 $ 1,100    
Issued (in shares) 22,644   22,644      
Synthonics            
Related Party Transaction [Line Items]            
Cost method investments $ 2,170   $ 2,170     $ 2,170
Cost method, ownership percentage 18.20%   18.20%     18.20%
Chief Executive Officer | Subsequent Event            
Related Party Transaction [Line Items]            
Deferred compensation to be paid out         $ 22,800