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Tax Credits and Losses Subject to Expiration by Major Jurisdictions (Details) (USD $) In Thousands, unless otherwise specified |  |  |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 Internal Revenue Service (IRS) | Dec. 31, 2013 Internal Revenue Service (IRS) Maximum | Dec. 31, 2013 Connecticut tax losses | Dec. 31, 2013 Connecticut tax losses Maximum | Dec. 31, 2013 Connecticut tax losses Minimum | Dec. 31, 2013 Georgia tax losses | Dec. 31, 2013 Georgia tax losses Maximum | Dec. 31, 2013 Georgia tax losses Minimum | Dec. 31, 2013 Idaho tax credits | Dec. 31, 2013 Idaho tax credits Maximum | Dec. 31, 2013 Idaho tax credits Minimum | Dec. 31, 2013 North Carolina tax credits | Dec. 31, 2013 North Carolina tax credits Maximum | Dec. 31, 2013 North Carolina tax credits Minimum | Dec. 31, 2013 Oklahoma tax losses | Dec. 31, 2013 Oklahoma tax losses Maximum | Dec. 31, 2013 Oklahoma tax losses Minimum | Dec. 31, 2013 Cellulosic Biofuel Producer Credit [Member] | Sep. 30, 2013 Cellulosic Biofuel Producer Credit [Member] | Dec. 31, 2013 Cellulosic Biofuel Producer Credit [Member] Internal Revenue Service (IRS) Maximum | Dec. 31, 2013 Foreign Tax Credit [Member] Internal Revenue Service (IRS) Maximum | Dec. 31, 2013 Foreign Tax Credit [Member] Internal Revenue Service (IRS) Minimum | Dec. 31, 2013 General Business Tax Credit Carryforward [Member] Internal Revenue Service (IRS) Maximum | Dec. 31, 2013 General Business Tax Credit Carryforward [Member] Internal Revenue Service (IRS) Minimum
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards, Expiration Date |  |  |  | Dec. 31, 2030 |  | Dec. 31, 2031 | Dec. 31, 2018 |  | Dec. 31, 2031 | Dec. 31, 2028 |  |  |  |  |  |  |  | Dec. 31, 2032 | Dec. 31, 2030 |  |  |  |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Domestic |  |  | $ 27,428 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign |  |  | 3,832 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, Other |  |  | 4,264 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax credit carryforward, expiration date |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2026 | Dec. 31, 2013 |  | Dec. 31, 2016 | Dec. 31, 2015 |  |  |  |  |  | Dec. 31, 2015 | Dec. 31, 2019 | Dec. 31, 2016 | Dec. 31, 2030 | Dec. 31, 2026
Tax Credit Carryforward, Amount | 27,597 | 20,447 |  |  |  |  |  |  |  |  | 4,851 |  |  | 15,966 |  |  |  |  |  | 3,495 | 3,500 |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  | $ 20,385 |  |  | $ 7,267 |  |  |  |  |  |  |  |  | $ 35,122 |  |  |  |  |  |  |  |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition The tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to other deductible tax credit carryforwards not separately disclosed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition Expiration date of each operating loss carryforward included in operating loss carryforward, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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