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Intangible Assets and Deferred Charges (Tables)
3 Months Ended
Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Intangible Assets Subject to Amortization
The balance of intangible assets subject to amortization are as follows:
(in thousands)March 31, 2021December 31, 2020
Intangible assets, gross$30,866 $30,866 
Accumulated amortization of intangible assets(20,120)(19,440)
Intangible assets, net$10,746 $11,426 
Schedule of Estimated Amortization Expense
Estimated amortization expense related to intangible assets for the next five years are as follows:
(in thousands)
Remainder of 2021$2,041 
20222,501 
20231,050 
2024952 
2025855 
2026758 
Thereafter2,589 
Schedule of Deferred Charges
The balance of deferred charges subject to amortization are as follows:
(in thousands)March 31, 2021December 31, 2020
Deferred charges, gross$388 $792 
Accumulated amortization of deferred charges(21)(337)
Deferred charges, net$367 $455