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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
	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