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Accumulated other comprehensive loss (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Accumulated other comprehensive loss [Roll Forward] |  |
Balance | $ 3,382,874 | $ 3,079,105
Other comprehensive income (loss) | 269 | 568
Balance | 3,360,718 | 3,100,306
Net unrealized gain (loss) on derivative instruments qualifying as hedges |  |
Accumulated other comprehensive loss [Roll Forward] |  |
Balance | (538) | (984)
Other comprehensive loss before reclassifications | 0 | 0
Amounts reclassified from accumulated other comprehensive loss | 112 | 111
Other comprehensive income (loss) | 112 | 111
Balance | (426) | (873)
Postretirement liability adjustment |  |
Accumulated other comprehensive loss [Roll Forward] |  |
Balance | (40,461) | (47,207)
Other comprehensive loss before reclassifications | 0 | 0
Amounts reclassified from accumulated other comprehensive loss | 445 | 466
Other comprehensive income (loss) | 445 | 466
Balance | (40,016) | (46,741)
Net unrealized gain (loss) on available-for-sale investments |  |
Accumulated other comprehensive loss [Roll Forward] |  |
Balance | (5) | 113
Other comprehensive loss before reclassifications | (320) | (44)
Amounts reclassified from accumulated other comprehensive loss | 32 | 35
Other comprehensive income (loss) | (288) | (9)
Balance | (293) | 104
Total accumulated other comprehensive loss |  |
Accumulated other comprehensive loss [Roll Forward] |  |
Balance | (41,004) | (48,078)
Other comprehensive loss before reclassifications | (320) | (44)
Amounts reclassified from accumulated other comprehensive loss | 589 | 612
Other comprehensive income (loss) | 269 | 568
Balance | $ (40,735) | $ (47,510)

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