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Level 4 Income Taxes (Details) (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Feb. 04, 2013
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Deferred tax assets, gross |  |  |  |  |  |  |  | $ 101,900,000
Deferred tax liabilities, gross |  |  |  |  |  |  |  | 33,200,000
Deferred tax assets, pensions |  |  |  |  |  |  |  | 69,800,000
Deferred tax liabilities, property and equipment |  |  |  |  |  |  |  | 27,400,000
Deferred tax assets, other employee benefits |  |  |  |  |  |  |  | 18,000,000
Income Taxes Paid, Net |  |  | 12,700,000 | 200,000 | 200,000 | 300,000 | 200,000 |
Income Tax Rate Reconciliation [Abstract] |  |  |  |  |  |  |  |
Income before income taxes | 17,209,000 | 15,125,000 | 36,938,000 | 16,854,000 | 41,803,000 | (46,123,000) | (32,997,000) |
Statutory U.S. income tax rate | 35.00% |  | 35.00% |  | 38.00% |  |  |
Statutory tax provision |  |  | 12,928,000 |  |  |  |  |
State taxes |  |  | 1,231,000 |  |  |  |  |
Other |  |  | 197,000 |  |  |  |  |
Effective income tax rate excluding discrete item |  |  | (147.00%) |  | 1.00% |  |  |
Recognition of beginning deferred tax balances |  |  | (68,666,000) |  |  |  |  |
Income tax provision (benefit) | 6,797,000 | 78,000 | (54,310,000) | 139,000 | 307,000 | 240,000 | 300,000 |
Current income tax provision (benefit) [Abstract] |  |  |  |  |  |  |  |
Federal |  |  | 10,208,000 |  |  |  |  |
State |  |  | 1,796,000 |  |  |  |  |
Foreign |  |  | 0 |  |  |  |  |
Total current |  |  | 12,004,000 |  |  |  |  |
Deferred income tax provision (benefit) [Abstract] |  |  |  |  |  |  |  |
Federal |  |  | (60,745,000) |  |  |  |  |
State |  |  | (5,569,000) |  |  |  |  |
Foreign |  |  | 0 |  |  |  |  |
Total deferred |  |  | (66,314,000) | 0 |  |  |  |
Income tax provision (benefit) | 6,797,000 | 78,000 | (54,310,000) | 139,000 | 307,000 | 240,000 | 300,000 |
Income tax expense, excluding discrete items [Member] |  |  |  |  |  |  |  |
Income Tax Rate Reconciliation [Abstract] |  |  |  |  |  |  |  |
Effective income tax rate excluding discrete item | 39.50% |  | 38.90% |  |  |  |  |
Income tax provision (benefit) | 6,800,000 |  | 14,356,000 |  |  |  |  |
Deferred income tax provision (benefit) [Abstract] |  |  |  |  |  |  |  |
Income tax provision (benefit) | 6,800,000 |  | 14,356,000 |  |  |  |  |
Capital loss carryforward [Member] |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Capital loss carryforwards, valuation allowance | $ 6,100,000 |  | $ 6,100,000 |  |  |  |  |

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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1 -Article 4 + Details
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