Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Share Repurchase Agreement (Details)

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Summary of Significant Accounting Policies - Share Repurchase Agreement (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Apr. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Open market purchase of treasury shares   $ 1,949,000  
Common Class A      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock repurchase program, authorized amount (up to)     $ 10,000,000
Treasury Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Open market purchase of common shares (in shares) 417,698 417,698  
Open market purchase of treasury shares $ 1,949,000 $ 1,949,000