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Note 9 - Interest Rate Swaps - Interest Rate Swaps on the Condensed Consolidated Balance Sheets and Statements of Operations and Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Interest rate swap liability $ 89,970   $ 89,970   $ 155,357
Accumulated other comprehensive loss 91,731   91,731   140,683
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]          
Accumulated other comprehensive loss 91,148   91,148   140,090
Interest Rate Swap [Member]          
Unrealized (gain) loss on cash flow hedges, gross (12,867) $ (7,610) (65,436) $ 117,262  
Less: Tax effect 3,364 1,806 16,494 (28,975)  
Unrealized (gain) loss on cash flow hedges, net of tax (9,503) (5,804) (48,942) 88,287  
Interest Rate Swap [Member] | Interest Expense [Member]          
Interest expense 7,920 $ 7,702 23,371 $ 14,750  
Interest Rate Swap [Member] | Cash Flow Hedging [Member]          
Interest rate swap liability 89,970   89,970   155,357
Total 120,566   120,566   186,003
Accounts Payable and Accrued Liabilities [Member]          
Derivative liability 30,596   30,596   30,646
Accounts Payable and Accrued Liabilities [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]          
Derivative liability $ 30,596   $ 30,596   $ 30,646