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Subordinated Debentures and Convertible Notes - Schedule of Convertible Debt (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 07, 2018
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Carrying Amount        
Interest on other borrowings and convertible notes   $ 2,302 $ 3,817  
Convertible Notes        
Debt Instrument [Line Items]        
Amortization/ Capitalization Period 5 years 5 years   5 years
Gross Carrying Amount        
Convertible notes principal balance   $ 217,500   $ 217,500
Discount       (21,880)
Issuance costs to be capitalized   (4,119)   (4,119)
Carrying balance of convertible notes   213,381   191,501
Accumulated Amortization / Capitalization        
Discount       10,951
Issuance costs to be capitalized   2,123   2,113
Carrying balance of convertible notes   2,123   13,064
Carrying Amount        
Convertible notes principal balance   217,500   217,500
Discount       (10,929)
Issuance costs to be capitalized   (1,996)   (2,006)
Carrying balance of convertible notes   $ 215,504   $ 204,565