| **Comprehensive Income (Tables)**                              | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
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| **Comprehensive Income [Abstract]**                            |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| Accumulated Other Comprehensive Loss, Net of Tax               | The components of accumulated other comprehensive loss, net of tax at June 30, 2013 and 2012, and changes for the six months then ended, are as follows:($ in thousands) Pension Costs  OPEB Costs  Deferred taxes on pension and OPEB costs All other  Total Balance at January 1, 2013 $(697,874) $(74,264) $288,712  $(150) $(483,576)Other comprehensive income before reclassifications  (230)  -   356   2    128 Amounts reclassified from accumulated other comprehensive loss  20,148   1,406   (8,190)  -    13,364 Net current-period other comprehensive income (loss)  19,918   1,406   (7,834)  2   13,492                       Balance at June 30, 2013 $(677,956) $(72,858) $280,878  $(148) $(470,084)                      ($ in thousands) Pension Costs  OPEB Costs  Deferred taxes on pension and OPEB costs All other  Total Balance at January 1, 2012 $(575,163) $(41,811) $230,161  $(150) $(386,963)Other comprehensive income before reclassifications  -   -   973   2   975 Amounts reclassified from accumulated other comprehensive loss  15,473   (1,184)  (5,430)  -    8,859 Net current-period other comprehensive income (loss)  15,473   (1,184)  (4,457)  2   9,834                       Balance at June 30, 2012 $(559,690) $(42,995) $225,704  $(148) $(377,129)                                                                                                                                                                                                                                                                                                                         |
| Reclassification Out of Accumulated Other Comprehensive Income | The significant items reclassified from each component of accumulated other comprehensive loss for the three and six months ended June 30, 2013 and 2012 are as follows: ($ in thousands) Amount Reclassified from     Accumulated Other Comprehensive Loss (a)      Details about Accumulated Other Comprehensive Loss Components Three months ended June 30, 2013  Three months ended June 30, 2012  Six months ended June 30, 2013    Six months ended June 30, 2012      Affected Line Item in the Statement Where Net Income is PresentedAmortization of Pension Cost Items (b)                  Prior-service costs $(2) $50  $(4)  $100      Actuarial gains/(losses)  (10,072)  (7,787)  (20,144)   (15,573 )         (10,074)  (7,737)  (20,148)   (15,473 ) Income before income taxes  Tax impact  3,828   2,940   7,656    5,880  Income tax (expense) benefit     $(6,246) $(4,797) $(12,492)  $(9,593 ) Net incomeAmortization of Postretirement Cost Items (b)                   Prior-service costs $1,525  $2,503  $3,050   $5,006      Actuarial gains/(losses)  (2,228)  (1,911)  (4,456)   (3,822 )         (703)  592   (1,406)   1,184  Income before income taxes  Tax impact  267   (225)  534    (450 ) Income tax (expense) benefit     $(436) $367  $(872)  $734  Net income                        (a)Amounts in parentheses indicate losses.                 (b)These accumulated other comprehensive loss components are included in the computation of net periodic pension and postretirement benefit cost (see Note 17 - Retirement Plans for additional details).  |

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| - Definition
Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss).
+ References
No definition available.
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| - Definition
Tabular disclosure of the components of accumulated other comprehensive income (loss).
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580
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