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Equity - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Oct. 31, 2016
Equity, Class of Treasury Stock [Line Items]              
Purchase of treasury stock $ 709 $ 1,485 $ 17,164 $ 3,876      
Treasury Stock              
Equity, Class of Treasury Stock [Line Items]              
Purchase of treasury stock (in shares) 52,600   714,865   113,433 833,510  
Purchase of treasury stock $ 709 $ 1,485 $ 17,164 $ 3,876 $ 2,200    
Class B Shares              
Equity, Class of Treasury Stock [Line Items]              
Number of shares authorized under share repurchase program (in shares)             4,000,000
Purchase of treasury stock (in shares)         100,000    
Remaining number of shares authorized to be repurchased (in shares) 900,000       900,000