Income Taxes (Details 5) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Tax benefits of these Mexican NOL carryforwards
Net operating loss carryforwards, or NOLs	$ 27,212	$ 34,824
2014 [Member] | Mexico [Member]
Tax benefits of these Mexican NOL carryforwards
Net operating loss carryforwards, or NOLs	1,200
2015 [Member] | Mexico [Member]
Tax benefits of these Mexican NOL carryforwards
Net operating loss carryforwards, or NOLs	4,500
2016 [Member] | Mexico [Member]
Tax benefits of these Mexican NOL carryforwards
Net operating loss carryforwards, or NOLs	7,200
2017 [Member] | Mexico [Member]
Tax benefits of these Mexican NOL carryforwards
Net operating loss carryforwards, or NOLs	5,800
2018 [Member] | Mexico [Member]
Tax benefits of these Mexican NOL carryforwards
Net operating loss carryforwards, or NOLs	0
2019 [Member] | Mexico [Member]
Tax benefits of these Mexican NOL carryforwards
Net operating loss carryforwards, or NOLs	0
2020 [Member] | Mexico [Member]
Tax benefits of these Mexican NOL carryforwards
Net operating loss carryforwards, or NOLs	200
2021 [Member] | Mexico [Member]
Tax benefits of these Mexican NOL carryforwards
Net operating loss carryforwards, or NOLs	100
Total [Member] | Mexico [Member]
Tax benefits of these Mexican NOL carryforwards
Net operating loss carryforwards, or NOLs	$ 19,000