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Shareholder's Equity and Dividends (Details 1) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Class Of Stock [Line Items]                          
Total Cash Dividends                     $ 11,734 $ 30,293 $ 4,356
Dividend Declared [Member]                          
Class Of Stock [Line Items]                          
Total Cash Dividends $ 3,458                        
Payment Date Mar. 08, 2021                        
Shareholders Record Date Feb. 25, 2021                        
Dividend Declared [Member] | Class A common stock [Member]                          
Class Of Stock [Line Items]                          
Dividends amount per share, declared $ 0.0750                        
Dividend Paid [Member]                          
Class Of Stock [Line Items]                          
Total Cash Dividends   $ 2,997 $ 1,383 $ 1,150 $ 6,205 $ 6,203 $ 6,879 $ 8,026 $ 9,171 $ 4,356      
Payment Date   Dec. 08, 2020 Sep. 08, 2020 Jun. 08, 2020 Mar. 09, 2020 Dec. 03, 2019 Sep. 06, 2019 May 29, 2019 Feb. 28, 2019 Nov. 15, 2018      
Shareholders Record Date   Nov. 24, 2020 Aug. 25, 2020 May 25, 2020 Feb. 25, 2020 Nov. 20, 2019 Aug. 26, 2019 May 17, 2019 Feb. 21, 2019 Nov. 08, 2018      
Dividend Paid [Member] | Class A common stock [Member]                          
Class Of Stock [Line Items]                          
Dividends amount per share   $ 0.0650 $ 0.0300 $ 0.0250 $ 0.1350 $ 0.1350 $ 0.1500 $ 0.1750 $ 0.2000 $ 0.0950