Income taxes Significant Components of our deferred tax assets & liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accrued postretirement benefit cost	$ 12,851	$ 9,184
Accrued liabilities	2,355	8,289
Share-based compensation	5,327	2,941
Derivative and hedging contracts	116,550	180,121
Goodwill	12,421	14,654
Equity contra - other comprehensive loss	61,216	81,039
Capital losses	14,512	9,056
Net operating losses and tax credits	637,721	509,618
Other	1,533	138
Total deferred tax assets	864,486	815,040
Valuation allowance	(765,023)	(656,352)
Net deferred tax assets	99,463	158,688
Tax over financial statement depreciation	(145,945)	(145,213)
Pension	(11,543)	(8,905)
Income from domestic partnership	0	4
Unremitted foreign earnings	(35,344)	(93,824)
Foreign basis differences	(790)	(3,204)
Total deferred tax liabilities	(193,622)	(251,142)
Net deferred tax liability	$ (94,159)	$ (92,454)

The amount as of the balance sheet date of the estimated future tax effects attributable to the difference between the tax basis and the basis in accordance with generally accepted accounting principles of foreign basis differences which will increase future taxable income when such basis difference reverses.

No definition available.