Income Taxes (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of effective tax rate with the federal statutory tax rate
Tax benefit (expense) from continuing operations	$ (41,051)	$ (72,743)	$ 32,433
State tax provision from continuing operations	(956)	(10,600)	4,726
Percentage depletion and related deductions	7,461	0	3,093
Change in valuation allowance	(12,651)	(6,032)	2,734
Non-deductible imputed interest	(525)	(808)	(1,718)
Uncertain tax positions	(9,849)	(1,279)	(299)
U.S. and foreign non-deductible expenses	(4,206)	(10,648)	(9,052)
Foreign exchange rates	(10,416)	(4,440)	(7,066)
Foreign inflation and indexing	712	(3,829)	(3,352)
Foreign tax rate differences	3,967	22,795	(9,861)
Foreign withholding taxes	(5,861)	(23,246)	(2,986)
Other, net	4,763	(3,507)	829
Income tax provision from continuing operations	$ (68,612)	$ (114,337)	$ 9,481