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Short-Term Borrowings and Long-Term Debt Repurchase Agreements (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Short-term Debt [Line Items]
Amount outstanding as of December 31	$ 329,719us-gaap_ShortTermBorrowings	$ 1,258,629us-gaap_ShortTermBorrowings	$ 868,399us-gaap_ShortTermBorrowings
Customer repurchase agreements
Short-term Debt [Line Items]
Amount outstanding as of December 31	158,394us-gaap_ShortTermBorrowings / us-gaap_ShortTermDebtTypeAxis = us-gaap_RepurchaseAgreementsMember	175,621us-gaap_ShortTermBorrowings / us-gaap_ShortTermDebtTypeAxis = us-gaap_RepurchaseAgreementsMember	156,238us-gaap_ShortTermBorrowings / us-gaap_ShortTermDebtTypeAxis = us-gaap_RepurchaseAgreementsMember
Weighted average interest rate at year end	0.13%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_ShortTermDebtTypeAxis = us-gaap_RepurchaseAgreementsMember	0.12%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_ShortTermDebtTypeAxis = us-gaap_RepurchaseAgreementsMember	0.16%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_ShortTermDebtTypeAxis = us-gaap_RepurchaseAgreementsMember
Average amount outstanding during the year	$ 197,432us-gaap_ShorttermDebtAverageOutstandingAmount / us-gaap_ShortTermDebtTypeAxis = us-gaap_RepurchaseAgreementsMember	$ 186,851us-gaap_ShorttermDebtAverageOutstandingAmount / us-gaap_ShortTermDebtTypeAxis = us-gaap_RepurchaseAgreementsMember	$ 206,842us-gaap_ShorttermDebtAverageOutstandingAmount / us-gaap_ShortTermDebtTypeAxis = us-gaap_RepurchaseAgreementsMember
Weighted average interest rate during the year	0.10%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_ShortTermDebtTypeAxis = us-gaap_RepurchaseAgreementsMember	0.11%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_ShortTermDebtTypeAxis = us-gaap_RepurchaseAgreementsMember	0.12%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_ShortTermDebtTypeAxis = us-gaap_RepurchaseAgreementsMember

X

- Definition

The average effective interest rate during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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+ Details

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X

- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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-Publisher SEC

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X

- Definition

For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period.

+ References

No definition available.

+ Details

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- Definition

Weighted average interest rate of short-term debt outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Section S99

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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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