Income Taxes (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Recorded valuation allowances
Recorded valuation allowances	$ 168,511	$ 164,036
United States [Member]
Recorded valuation allowances
Recorded valuation allowances	123,539	121,159
Argentina [Member]
Recorded valuation allowances
Recorded valuation allowances	10,739	7,591
Canada [Member]
Recorded valuation allowances
Recorded valuation allowances	5,390	6,720
New Zealand [Member]
Recorded valuation allowances
Recorded valuation allowances	27,026	26,871
Other [Member]
Recorded valuation allowances
Recorded valuation allowances	$ 1,817	$ 1,695