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Fair value measurements - Measurement of Fair Value of Major Asset and Liability classed (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities (short-term) | $ 1,653 | $ 1,713
Available for sale investments (long-term) | 32,052 | 32,631
Total assets | 33,705 | 34,356
Total Liabilities | 7,485 | 3,670
Interest rate cap and interest rate swap | Total derivatives designated as hedging instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative instruments |  | 12
Derivative instruments | 7,485 | 3,670
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities (short-term) | 1,653 | 1,713
Available for sale investments (long-term) | 0 | 0
Total assets | 1,653 | 1,713
Total Liabilities | 0 | 0
Level 1 | Interest rate cap and interest rate swap | Total derivatives designated as hedging instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative instruments |  | 0
Derivative instruments | 0 | 0
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities (short-term) | 0 | 0
Available for sale investments (long-term) | 0 | 0
Total assets | 0 | 12
Total Liabilities | 7,485 | 3,670
Level 2 | Interest rate cap and interest rate swap | Total derivatives designated as hedging instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative instruments | 0 | 12
Derivative instruments | 7,485 | 3,670
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities (short-term) | 0 | 0
Available for sale investments (long-term) | 0 | 0
Total assets | 0 | 0
Total Liabilities | 0 | 0
Level 3 | Interest rate cap and interest rate swap | Total derivatives designated as hedging instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative instruments |  | 0
Derivative instruments | 0 | 0
Investments Measured at Net Asset Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale securities (short-term) | 0 | 0
Available for sale investments (long-term) | 32,052 | 32,631
Total assets | 32,052 | 32,631
Total Liabilities | 0 | 0
Investments Measured at Net Asset Value | Interest rate cap and interest rate swap | Total derivatives designated as hedging instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative instruments |  | 0
Derivative instruments | $ 0 | $ 0

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