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Comprehensive income (loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Accumulated other comprehensive income (loss) [Roll Forward] |  |  |  |
Balance |  |  | $ 3,249,784 | $ 2,855,902
Amounts reclassified from accumulated other comprehensive loss | $ (510) | $ (374) | (2,540) | (1,320)
Net current-period other comprehensive income (loss) | 402 | 166 | 2,259 | 1,173
Balance | 2,514,871 | 3,158,503 | 2,514,871 | 3,158,503
Net Unrealized Gain (Loss) on Derivative Instruments Qualifying as Hedges |  |  |  |
Accumulated other comprehensive income (loss) [Roll Forward] |  |  |  |
Balance | (2,872) | (3,408) | (3,071) | (3,765)
Other comprehensive loss before reclassifications | 0 | 0 | 0 | 0
Amounts reclassified from accumulated other comprehensive loss | 100 | 82 | 299 | 439
Net current-period other comprehensive income (loss) | 100 | 82 | 299 | 439
Balance | (2,772) | (3,326) | (2,772) | (3,326)
Postretirement liability adjustment |  |  |  |
Accumulated other comprehensive income (loss) [Roll Forward] |  |  |  |
Balance | (37,259) | (33,287) | (38,218) | (33,807)
Other comprehensive loss before reclassifications | 0 | 0 | 0 | 0
Amounts reclassified from accumulated other comprehensive loss | 382 | 261 | 1,341 | 781
Net current-period other comprehensive income (loss) | 382 | 261 | 1,341 | 781
Balance | (36,877) | (33,026) | (36,877) | (33,026)
Foreign currency translation adjustment |  |  |  |
Accumulated other comprehensive income (loss) [Roll Forward] |  |  |  |
Balance | (130) | (579) | (829) | (667)
Other comprehensive loss before reclassifications | (73) | (146) | (176) | (58)
Amounts reclassified from accumulated other comprehensive loss | 0 | 0 | 802 | 0
Net current-period other comprehensive income (loss) | (73) | (146) | 626 | (58)
Balance | (203) | (725) | (203) | (725)
Net unrealized gain (loss) on available-for-sale investments |  |  |  |
Accumulated other comprehensive income (loss) [Roll Forward] |  |  |  |
Balance | 15 | 76 | 15 | 34
Other comprehensive loss before reclassifications | (35) | (62) | (105) | (89)
Amounts reclassified from accumulated other comprehensive loss | 28 | 31 | 98 | 100
Net current-period other comprehensive income (loss) | (7) | (31) | (7) | 11
Balance | 8 | 45 | 8 | 45
Total accumulated other comprehensive loss |  |  |  |
Accumulated other comprehensive income (loss) [Roll Forward] |  |  |  |
Balance | (40,246) | (37,198) | (42,103) | (38,205)
Other comprehensive loss before reclassifications | (108) | (208) | (281) | (147)
Amounts reclassified from accumulated other comprehensive loss | 510 | 374 | 2,540 | 1,320
Net current-period other comprehensive income (loss) | 402 | 166 | 2,259 | 1,173
Balance | $ (39,844) | $ (37,032) | $ (39,844) | $ (37,032)

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