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Long-term debt: (Tables)
12 Months Ended
Dec. 31, 2025
Long-term debt:  
Schedule of aggregate future contractual maturities of long-term debt

The aggregate future contractual maturities of long-term debt were as follows as of December 31, 2025 (in thousands):

For the year ending December 31, 

  ​ ​ ​

2026

$

2027

 

750,000

2028

 

2029

 

206,000

2030

 

174,400

Thereafter

 

600,000

Total

$

1,730,400