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Commitments and Contingent Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2012
Commitments and Contingent Liabilities [Abstract] |
Credit Facilities [Table Text Block] |
|  |  |  |  | Amount Utilized(1) |  |
|  |  |  |  | December 31, |  |
| Facility Capacity |  | Maturity Date |  | 2012 |  | 2011 |  | Basis of Fees
| $850.0 |  | December 2015 |  | $ | 402.9 |  | $ | 183.5 |  | Senior unsecured long-term debt rating
| $200.0 |  | September 2019 |  |  | 200.0 |  |  | 200.0 |  | Fixed
| $120.0 |  | May 2016 |  |  | 100.0 |  |  | -- |  | Fixed
(1) | Represents issued but undrawn letters of credit. There was no cash borrowed for the periods presented.
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] |
| Operating |  | Sublease
| Leases |  | Income
2013 | $ | 14,609 |  | $ | 827
2014 |  | 12,378 |  |  | 827
2015 |  | 7,089 |  |  | 827
2016 |  | 6,369 |  |  | 776
2017 |  | 5,152 |  |  | 160
Thereafter |  | 18,876 |  |  | --

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- Definition Table that provides the company's credit facilities by listed by capacity, maturity date, amount utilized and basis of fees. + References No definition available. + Details
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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 840 -SubTopic 20 -Publisher FASB -Number -Article -Subparagraph -Name Accounting Standards Codification -Paragraph 2 -Section 50 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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