Condensed Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net income (loss)	$ 45,751	$ 9,121	$ (388,264)	$ 71,625
Other Comprehensive Income (Loss), net of income taxes [Abstract]
Pension, postretirement and other post-employment benefits, reclassifications into net income	(615)	386	(3,795)	1,249
Unrealized gains (losses) on available-for-sale securities	(555)	(569)	(241)	(1,256)
Unrealized gains and losses on derivatives, net of reclassifications into net income:
Unrealized gains (losses) on derivatives	65	(3,671)	2,816	2,703
Reclassifications of (gains) losses into net income	(347)	(3,575)	3,960	(10,059)
Total other comprehensive income (loss)	(1,452)	(7,429)	2,740	(7,363)
Total comprehensive income (loss)	$ 44,299	$ 1,692	$ (385,524)	$ 64,262