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Comprehensive income (loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accumulated other comprehensive income (loss) [Roll Forward]
Balance	$ 2,520,548	$ 3,249,784
Amounts reclassified from accumulated other comprehensive loss	1,467	(1,312)
Net current-period other comprehensive income (loss)	(1,434)	1,179
Balance	2,495,384	2,934,443
Net unrealized gain (loss) on derivative instruments qualifying as hedges
Accumulated other comprehensive income (loss) [Roll Forward]
Balance	(2,667)	(3,071)
Other comprehensive loss before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive loss	92	99
Net current-period other comprehensive income (loss)	92	99
Balance	(2,575)	(2,972)
Postretirement liability adjustment
Accumulated other comprehensive income (loss) [Roll Forward]
Balance	(34,257)	(38,218)
Other comprehensive loss before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive loss	(1,595)	375
Net current-period other comprehensive income (loss)	(1,595)	375
Balance	(35,852)	(37,843)
Foreign currency translation adjustment
Accumulated other comprehensive income (loss) [Roll Forward]
Balance	(200)	(829)
Other comprehensive loss before reclassifications	25	(112)
Amounts reclassified from accumulated other comprehensive loss	0	802
Net current-period other comprehensive income (loss)	25	690
Balance	(175)	(139)
Net unrealized gain (loss) on available-for-sale investments
Accumulated other comprehensive income (loss) [Roll Forward]
Balance	(24)	15
Other comprehensive loss before reclassifications	8	(21)
Amounts reclassified from accumulated other comprehensive loss	36	36
Net current-period other comprehensive income (loss)	44	15
Balance	20	30
Total accumulated other comprehensive loss
Accumulated other comprehensive income (loss) [Roll Forward]
Balance	(37,148)	(42,103)
Other comprehensive loss before reclassifications	33	(133)
Amounts reclassified from accumulated other comprehensive loss	(1,467)	1,312
Net current-period other comprehensive income (loss)	(1,434)	1,179
Balance	$ (38,582)	$ (40,924)

X

- Definition

Amount after tax, before reclassification adjustments of other comprehensive income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
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-URI http://asc.fasb.org/extlink&oid=66004921&loc=d3e1436-108581

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