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Commitments and Contingent Liabilities (Schedule of Line of Credit Facilities) (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012
Line of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 880,900,000.0 |  |  |
Syndicated Credit Facility $850 Million [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 850,000,000.0 |  |  |
Line of Credit Facility, Expiration Date | Dec. 31, 2015 |  |  |
Credit Facility Amount Utilized | 67,600,000 | [1] | 402,900,000 | [1]
Credit Facility Basis Of Fees | Senior unsecured long-term debt rating |  |  |
Credit Facility 200 Million [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 200,000,000.0 |  |  |
Line of Credit Facility, Expiration Date | Sep. 30, 2019 |  |  |
Credit Facility Amount Utilized | 200,000,000 | [1] | 200,000,000 | [1]
Credit Facility Basis Of Fees | Fixed |  |  |
Credit Facility 120 Million [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 120,000,000.0 |  |  |
Line of Credit Facility, Expiration Date | May 31, 2016 |  |  |
Credit Facility Amount Utilized | 85,100,000 | [1] | 100,000,000 | [1]
Credit Facility Basis Of Fees | Fixed |  |  |
Credit Facility 270 Million [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 270,000,000.0 |  |  |
Line of Credit Facility, Expiration Date | Nov. 30, 2017 |  |  |
Credit Facility Amount Utilized | 270,000,000 | [1] | 0 | [1]
Credit Facility Basis Of Fees | Fixed |  |  |
Credit Facility 100 Million [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 100,000,000.0 |  |  |
Line of Credit Facility, Expiration Date | Jun. 30, 2017 |  |  |
Credit Facility Amount Utilized | 89,400,000 | [1] | 0 | [1]
Credit Facility Basis Of Fees | Fixed |  |  |
Credit Facility 58 Million [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 58,400,000.0 |  |  |
Line of Credit Facility, Expiration Date | Nov. 30, 2014 |  |  |
Credit Facility Amount Utilized | 58,400,000 | [1] | 0 | [1]
Credit Facility Basis Of Fees | Fixed |  |  |
Credit Facility 132 Million [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 132,500,000.0 |  |  |
Line of Credit Facility, Expiration Date | Mar. 31, 2019 |  |  |
Credit Facility Amount Utilized | $ 132,500,000 | [1] | $ 0 | [1]
Credit Facility Basis Of Fees | Fixed |  |  |
[1] | Represents issued but undrawn letters of credit. There was no cash borrowed for the periods presented.

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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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