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Pension And Postretirement Benefits (Summary Of Pension Plan Assets Valued Using Net Asset Value (NAV) Or Its Equivalent) (Details) (Pension Benefits [Member], USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Archstone Offshore Fund, Ltd [Member] |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |  |
Fair Value | $ 30,605 | [1],[2] | $ 28,241 | [1],[2]
Redemption Frequency | 12 Months | [1] | 12 Months | [1]
Unfunded Commitment | None | [1] | None | [1]
Other Redemption Restrictions | None | [1] | None | [1]
Redemption Notice Period | 90 days written | [1] | 90 days written | [1]
Evanston Capital Management [Member] |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |  |
Fair Value | 25,587 | [1],[2] | 24,055 | [1],[2]
Redemption Frequency | 12 Months | [1] | 12 Months | [1]
Unfunded Commitment | None | [1] | None | [1]
Other Redemption Restrictions | None | [1] | None | [1]
Redemption Notice Period | 65 days written | [1] | 65 days written | [1]
Strategic Value Fund [Member] |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |  |
Fair Value | 17,238 | [1],[2] | 15,671 | [1],[2]
Redemption Frequency | 12 Months | [1] | 12 Months | [1]
Unfunded Commitment | None | [1] | None | [1]
Other Redemption Restrictions | None | [1] | None | [1]
Redemption Notice Period | 90 days written | [1] | 90 days written | [1]
U.S. Equity Funds [Member] |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |  |
Fair Value | 80,171 | [1],[2] | 26,322 | [1],[2]
Redemption Frequency | immediate | [1] | immediate | [1]
Unfunded Commitment | None | [1] | None | [1]
Other Redemption Restrictions | None | [1] | None | [1]
Redemption Notice Period | None | [1] | None | [1]
Non-U.S. Equity Funds [Member] |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |  |
Fair Value | 178,841 | [1],[2] | 198,655 | [1],[2]
Redemption Frequency | immediate | [1] | immediate | [1]
Unfunded Commitment | None | [1] | None | [1]
Other Redemption Restrictions | None | [1] | None | [1]
Redemption Notice Period | None | [1] | None | [1]
Non-U.S. Fixed Income, Government And Corporate [Member] |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |  |
Fair Value | 181,073 | [1],[2] | 159,611 | [1],[2]
Redemption Frequency | immediate | [1] | immediate | [1]
Unfunded Commitment | None | [1] | None | [1]
Other Redemption Restrictions | None | [1] | None | [1]
Redemption Notice Period | None | [1] | None | [1]
International Property Funds [Member] |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |  |
Fair Value | 9,445 | [1],[2] | 9,011 | [1],[2]
Redemption Frequency | immediate | [1] | immediate | [1]
Unfunded Commitment | None | [1] | None | [1]
Other Redemption Restrictions | None | [1] | None | [1]
Redemption Notice Period | None | [1] | None | [1]
International Balanced Funds [Member] |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |  |
Fair Value | 8,836 | [1],[2] | 8,223 | [1],[2]
Redemption Frequency | immediate | [1] | immediate | [1]
Unfunded Commitment | None | [1] | None | [1]
Other Redemption Restrictions | None | [1] | None | [1]
Redemption Notice Period | None | [1] | None | [1]
U.S. Government and Corporate Fixed Income [Member] |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |  |
Fair Value | 43,182 | [1],[2] | 33,810 | [1],[2]
Redemption Frequency | immediate | [1] | immediate | [1]
Unfunded Commitment | None | [1] | None | [1]
Other Redemption Restrictions | None | [1] | None | [1]
Redemption Notice Period | None | [1] | None | [1]
U.S. Tactical Allocation Balanced Fund [Member] |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |  |
Fair Value | $ 18,997 | [1],[2] | $ 16,455 | [1],[2]
Redemption Frequency | immediate | [1] | immediate | [1]
Unfunded Commitment | None | [1] | None | [1]
Other Redemption Restrictions | None | [1] | None | [1]
Redemption Notice Period | None | [1] | None | [1]
[1] |
[2] | The fair values of the investments have been estimated using the net asset value of the investment

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- Definition Other Redemption Restrictions + References No definition available. + Details
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- Definition Unfunded Commitment + References No definition available. + Details
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- Definition This element represents the total fair market value of investments in certain entities that calculate net asset value per share (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments). This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements, but may also be used in both the balance sheet and disclosure in the same submission. This item represents alternative investments as of the balance sheet date which may include investments in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds, and any other investment in which investee management calculates net asset value per share as the primary metric for investment value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=SL6742756-110258 + Details
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- Definition States the frequency (for example, annually, semi-annually, quarterly) with which the entity can redeem its investment, or portion thereof, for each of those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments), by major category. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7578670&loc=SL6742756-110258 + Details
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- Definition States the notice requirement (for example, 30 to 60 days) the entity is required to deliver before it can redeem its investment, or portion thereof, for each of those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments), by major category. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7578670&loc=SL6742756-110258 + Details
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