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Post-Employment Benefits (Details Textual) (USD $)
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12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Amortization of Net Gains (Losses) | $ 0 | $ (100,000) | $ (100,000) |
| OPEB Plan [Member] | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year | 100,000 | ||
| Defined Benefit Plan, Amortization of Net Gains (Losses) | $ 5,000 | $ 23,000 | $ 43,000 |