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Intangible Assets and Deferred Charges (Tables)
9 Months Ended
Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Intangible Assets Subject to Amortization
The balances of intangible assets subject to amortization are as follows:
(in thousands)September 30, 2021December 31, 2020
Intangible assets, gross$30,866 $30,866 
Accumulated amortization of intangible assets(21,481)(19,440)
Intangible assets, net$9,385 $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$680 
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)September 30, 2021December 31, 2020
Deferred charges, gross$398 $792 
Accumulated amortization of deferred charges(71)(337)
Deferred charges, net$327 $455