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Debt and Leases - Interest Rate Swaps (Details) - USD ($) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2009 | Mar. 31, 2009 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Interest rate swaps: |  |  |  |  |  |
Interest expense for settlements related to swaps |  |  | $ 32,000 | $ 70,000 | $ 110,000 |
Industrial Development Revenue Bond swap agreement | Interest rate swap | Cash flow hedging | Designated as hedging instrument |  |  |  |  |  |
Interest rate swaps: |  |  |  |  |  |
Derivative, fixed interest rate |  |  |  | 4.89% |  |
Debt Instrument, Description of Variable Rate Basis | 30-day commercial paper rate |  |  |  |  |
Percentage of variable rate receivable | 76.00% |  |  |  |  |
Derivative, variable interest rate |  |  |  |  |  | 0.10%
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. |  |
Pre-tax loss previously recognized in Accumulated Other Comprehensive Income | $ 200,000 |  |  |  |  |
Pre-tax loss previously recognized in Accumulated Other Comprehensive Income, monthly amortization amount | 5,000 |  |  |  |  |
Pre-tax loss previously recognized in Accumulated Other Comprehensive Income, monthly amortization amount, net of tax | $ 3,000 |  |  |  |  |
Capex loan swap agreement | Interest rate swap | Cash flow hedging | Designated as hedging instrument |  |  |  |  |  |
Interest rate swaps: |  |  |  |  |  |
Derivative, fixed interest rate |  |  | 2.295% |  |  |
Debt Instrument, Description of Variable Rate Basis |  |  | LIBOR |  |  |
Derivative, variable interest rate |  |  |  | 0.44% |  |
Description of reclassification of cash flow hedge gain (loss) |  |  | 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 |  | $ 146,000 |  |  |  |
Pre-tax loss previously recognized in Accumulated Other Comprehensive Income, monthly amortization amount |  | 2,000 |  |  |  |
Pre-tax loss previously recognized in Accumulated Other Comprehensive Income, monthly amortization amount, net of tax |  | $ 1,000 |  |  |  |
Derivatives not designated as hedging instruments, interest rate swap liabilities |  |  | $ 2,000 | $ 37,000 |  |
Interest income (loss) for mark-to-market adjustment of swap fair value |  |  | (35,000) | 66,000 | $ 102,000 |
Derivative, Notional Amount |  |  | 714,000 | $ 2,428,000 |  |
Debt instrument, face amount |  |  | $ 12,000,000 |  |  |

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