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Debt and Leases - Interest Rate Swaps (Details) (USD $) | 12 Months Ended |  | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 Capex loan | Dec. 31, 2013 Industrial Development Revenue Bond swap agreement | Dec. 31, 2012 Industrial Development Revenue Bond swap agreement | Dec. 31, 2009 Industrial Development Revenue Bond swap agreement Interest rate swap Cash flow hedging Designated as hedging instrument | Dec. 31, 2013 Capex loan swap agreement | Dec. 31, 2012 Capex loan swap agreement | Mar. 31, 2009 Capex loan swap agreement Interest rate swap Cash flow hedging Designated as hedging instrument
Interest rate swaps: |  |  |  |  |  |  |  |  |
Derivative, fixed interest rate |  |  |  |  | 4.89% |  | 2.295% |  |
Percentage of variable rate receivable |  |  |  |  |  | 76.00% |  |  |
Derivative, description of variable rate basis |  |  |  |  | 76% of the 30-day commercial paper rate | 30-day commercial paper rate | LIBOR |  |
Derivative, variable interest rate |  |  |  |  | 0.10% |  | 0.17% |  |
Description of reclassification of cash flow hedge gain (loss) |  |  |  |  | The pre-tax loss previously recognized in Accumulated Other Comprehensive Income (Loss), totaling $200,000 as of December 31, 2009, was amortized as an increase to interest expense of $5,000 per month, or $3,000 net of tax, over the remaining term of the interest rate swap agreement. |  | The pre-tax loss previously recognized in Accumulated Other Comprehensive Income (Loss), totaling $146,000 as of March 31, 2009, is being amortized as an increase to interest expense of $2,000 per month, or $1,000 net of tax, over the remaining term of the interest rate swap agreement. |  |
Pre-tax loss previously recognized in Accumulated Other Comprehensive Income |  |  |  |  |  | $ 200,000 |  |  | $ 146,000
Pre-tax loss previously recognized in Accumulated Other Comprehensive Income, monthly amortization amount |  |  |  |  |  | 5,000 |  |  | 2,000
Pre-tax loss previously recognized in Accumulated Other Comprehensive Income, monthly amortization amount, net of tax |  |  |  |  |  | 3,000 |  |  | 1,000
Derivatives not designated as hedging instruments, interest rate swap liabilities |  |  |  |  | 8,000 |  | 103,000 | 205,000 |
Interest income (loss) for mark-to-market adjustment of swap fair value |  |  |  | 8,000 | 44,000 |  | 102,000 | (74,000) |
Derivative, Notional Amount |  |  |  |  | 420,000 |  | 4,143,000 | 5,857,000 |
Debt instrument, face amount |  |  | 12,000,000 |  |  |  |  |  |
Interest expense for settlements related to swaps | $ 110,000 | $ 170,000 |  |  |  |  |  |  |

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- Definition Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Net of Tax, Accumulated Other Comprehensive Income (Loss), Monthly Amortization + References No definition available. + Details
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- Definition Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss), Monthly Amortization + References No definition available. + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition The reference rate for the variable rate of the interest rate derivative, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226008-175313 + Details
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- Definition The net gain (loss) included in earnings for the period relating to components of the gain (loss) on interest rate fair value hedging instruments excluded from the assessment of fair value hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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