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Defined Benefit Pension Plans Defined Benefit Pension Plan Employer Contributions Additional Information (Details) (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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| Defined Benefit Plan Disclosure [Line Items] | ||
| Estimated Future Employer Contributions in Next Fiscal Year | $ 426,000 | |
| Fair Value of Plan Assets [Member] | ||
| Defined Benefit Plan Disclosure [Line Items] | ||
| Defined Benefit Plan, Contributions by Employer | $ 375,000 | $ 436,000 |
| Defined Benefit Obligations [Member] | ||
| Defined Benefit Plan Disclosure [Line Items] | ||
| Defined Benefit Plan, Change in Discount Rate | 140 basis point | |