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Defined Benefit Pension Plans Defined Benefit Pension Plan Additional Information (Details) (USD $)
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9 Months Ended | 12 Months Ended | |
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Sep. 30, 2014
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Sep. 30, 2013
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Dec. 31, 2013
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| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Contributions by Employer | $ 389,000 | $ 394,000 | $ 436,000 |
| Estimated Future Employer Contributions in Current Fiscal Year | $ 425,000 | ||