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Note 7 - Borrowings (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
May 24, 2023
Feb. 25, 2022
Jun. 22, 2021
Apr. 24, 2021
Apr. 21, 2020
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Jun. 29, 2023
Nov. 09, 2022
Jun. 15, 2022
Mar. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Sep. 15, 2019
Aug. 13, 2019
Dec. 31, 2018
Dec. 31, 2017
Oct. 11, 2017
Sep. 29, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Restricted Investments           $ 2,642 $ 2,788                                
Long-Term Debt, Gross [1]           466,000 439,323 $ 260,250         $ 187,625 $ 154,375     $ 127,875 $ 95,375     $ 96,000 $ 115,546 $ 81,753
Debt Instrument, Face Amount           615,000 582,573                                
Interest Paid, Excluding Capitalized Interest, Operating Activities           $ 26,880 $ 17,028 10,706                              
Key Facility [Member]                                              
Line of Credit Facility, Maximum Borrowing Capacity, Accordian Feature                 $ 150,000                            
Line of Credit Facility, Maximum Borrowing Capacity                 $ 300,000                            
Line of Credit Facility, Advance Rate of Eligible Debt Investments                 60.00%                            
Long-Term Debt, Weighted Average Interest Rate, over Time           8.45% 5.33%                                
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage           0.50%                                  
Line of Credit Facility, Current Borrowing Capacity           $ 80,000 $ 120,000                                
Line of Credit Facility, Remaining Borrowing Capacity           25,000 40,200                                
Long-Term Debt, Gross           70,000 5,000                                
Debt Instrument, Face Amount           $ 150,000 $ 125,000                                
Key Facility [Member] | London Interbank Offered Rate (LIBOR) 1 [Member]                                              
Debt Instrument, Basis Spread on Variable Rate     3.25%                                        
Key Facility [Member] | Prime Rate [Member]                                              
Debt Instrument, Basis Spread on Variable Rate           0.25%                                  
Debt Instrument, Variable Rate           8.50% 7.50%                                
NYL Facility [Member]                                              
Line of Credit Facility, Maximum Borrowing Capacity $ 250,000       $ 100,000                                    
Line of Credit Facility, Current Borrowing Capacity           $ 69,000 $ 23,200                                
Line of Credit Facility, Remaining Borrowing Capacity           17,400 23,200                                
Line of Credit Facility, Maximum Borrowing Capacity, Accordion Feature         $ 200,000                                    
Line of Credit Facility, Advance Rate         67.00%                                    
Line of Credit Facility, Change in Maximum Borrowing Capacity $ 50,000 $ 100,000                                          
Debt Instrument, Interest Rate, Stated Percentage 4.60%                                            
Long-Term Line of Credit           $ 181,000 $ 176,800                                
Line of Credit Facility, Interest Rate at Period End           5.96% 5.57%                                
Restricted Investments           $ 1,400 $ 1,000                                
Long-Term Debt, Gross           181,000 176,750                                
Debt Instrument, Face Amount           250,000 200,000                                
NYL Facility [Member] | USD Mid-market Swap Rate [Member]                                              
Debt Instrument, Basis Spread on Variable Rate   3.00%                                          
NYL Facility [Member] | Three Year I Curve [Member]                                              
Debt Instrument, Basis Spread on Variable Rate 3.50%                                            
Asset-backed Notes 2019 [Member]                                              
Debt Instrument, Interest Rate, Stated Percentage                               4.21%              
Restricted Investments             600                                
Payments of Debt Issuance Costs           200                                  
Long-Term Debt, Gross           0 42,573                                
Debt Instrument, Face Amount           0 42,573                 $ 160,000              
Asset-backed Notes 2022 [Member]                                              
Debt Instrument, Interest Rate, Stated Percentage                   7.56%                          
Restricted Investments           1,300 1,200                                
Long-Term Debt, Gross           100,000 100,000                                
Debt Instrument, Face Amount           100,000 100,000     $ 157,800                          
The 6.25 % Notes Due 2022 [Member]                                              
Debt Instrument, Interest Rate, Stated Percentage                                       6.25%      
Debt Instrument, Face Amount                                       $ 32,500      
Additional 2022 Notes [Member]                                              
Debt Instrument, Face Amount                                     $ 4,900        
The 2022 Notes [Member]                                              
Debt Instrument, Interest Rate, Stated Percentage                             6.25%                
Payments of Debt Issuance Costs       $ 400                                      
Long-Term Debt, Gross [2]           0 0 0         37,375 37,375     37,375 37,375     0 0 0
Debt Instrument, Convertible, Conversion Price (in dollars per share)                             $ 25                
Repayments of Debt       37,400                                      
Interest Paid, Excluding Capitalized Interest, Operating Activities       $ 300                                      
The 2026 Notes [Member]                                              
Debt Instrument, Interest Rate, Stated Percentage                       4.875%                      
Long-Term Debt, Gross [2]           57,500 57,500 57,500         0 0     0 0     0 0 0
Debt Instrument, Face Amount           57,500 57,500         $ 57,500                      
The 2026 Notes Underwriter Option [Member]                                              
Debt Instrument, Face Amount                       $ 7,500                      
Debt Instrument, Convertible, Conversion Price (in dollars per share)                       $ 25                      
The 2027 Notes [Member]                                              
Debt Instrument, Interest Rate, Stated Percentage                     6.25%                        
Long-Term Debt, Gross [2]           57,500 57,500 $ 0         $ 0 $ 0     $ 0 $ 0     $ 0 $ 0 $ 0
Debt Instrument, Face Amount           $ 57,500 $ 57,500       $ 50,000                        
The 2027 Notes Underwriter Option [Member]                                              
Debt Instrument, Face Amount                     $ 7,500                        
Debt Instrument, Convertible, Conversion Price (in dollars per share)                     $ 25                        
Minimum [Member]                                              
Asset Coverage to Borrowings, Ratio, Percent           150.00%                                  
Minimum [Member] | Key Facility [Member] | London Interbank Offered Rate (LIBOR) 1 [Member]                                              
Debt Instrument, Basis Spread on Variable Rate     1.00%                                        
Minimum [Member] | Key Facility [Member] | Prime Rate [Member]                                              
Debt Instrument, Basis Spread on Variable Rate           4.25%                                  
Minimum [Member] | NYL Facility [Member] | USD Mid-market Swap Rate [Member]                                              
Debt Instrument, Basis Spread on Variable Rate         3.55%                                    
Maximum [Member]                                              
Asset Coverage to Borrowings, Ratio, Percent           170.00%                                  
Maximum [Member] | NYL Facility [Member] | USD Mid-market Swap Rate [Member]                                              
Debt Instrument, Basis Spread on Variable Rate         5.15%                                    
[1] Total amount of senior securities outstanding at the end of the period presented.
[2] Total amount of senior securities outstanding at the end of the period presented.