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Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash collateral | $ 800 | $ 0
Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 171 | 480
Net assets | 126 | 419
Fair Value, Measurements, Recurring [Member] | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Net assets | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 171 | 480
Net assets | 126 | 419
Fair Value, Measurements, Recurring [Member] | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | 0 | 0
Net assets | 0 | 0
Fair Value, Measurements, Recurring [Member] | Interest rate derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | 0 | 24
Fair Value, Measurements, Recurring [Member] | Interest rate derivatives | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | 0 | 0
Fair Value, Measurements, Recurring [Member] | Interest rate derivatives | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | 0 |
Fair Value, Measurements, Recurring [Member] | Interest rate derivatives | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | 0 | 0
Fair Value, Measurements, Recurring [Member] | OTC commodity swaps |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | 171 | 456
Derivative Liability | (45) | (61)
Fair Value, Measurements, Recurring [Member] | OTC commodity swaps | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | 0 | 0
Derivative Liability | 0 | 0
Fair Value, Measurements, Recurring [Member] | OTC commodity swaps | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | 171 |
Derivative Liability | (45) |
Fair Value, Measurements, Recurring [Member] | OTC commodity swaps | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | 0 | 0
Derivative Liability | 0 | $ 0
Other Noncurrent Assets [Member] | Derivatives not designated as hedging instrument [Member] | Fair Value, Measurements, Recurring [Member] | Interest rate derivatives | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | 24 |
Other Current Assets [Member] | Derivatives not designated as hedging instrument [Member] | Fair Value, Measurements, Recurring [Member] | OTC commodity swaps | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | 456 |
Derivative Liability | $ (61) |

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