Derivative Financial Instruments (Cash Collateral on Derivative Financial Instruments) (Details) (USD $)
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Dec. 31, 2013
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Dec. 31, 2012
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Derivative [Line Items] | ||
Cash pledged as collateral | $ 5,400,000 | $ 6,700,000 |
Counterparties
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Derivative [Line Items] | ||
Cash pledged as collateral | $ 540,000 | $ 0 |