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Level 4 Stockholders' Equity (Details) (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 0 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Jun. 30, 2013 Underwriting discounts and commissions [Member] | Jun. 30, 2013 Other offering expenses [Member] | Feb. 11, 2013 Subsequent Event [Member] | Jul. 30, 2013 Subsequent Event [Member]
Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock issued in IPO |  |  |  |  | 13,529,412 |  |  |  |  |  |  |  |  | 13,529,412 |
Net proceeds from issuance of common stock |  |  |  |  | $ 262,599,000 |  | $ 0 |  |  |  |  |  |  | $ 263,000,000 |
Stock issuance costs |  |  |  |  |  |  |  |  |  |  |  | 19,200,000 | 2,300,000 |  |
Common stock, authorized | 300,000,000 |  |  |  | 300,000,000 |  |  |  | 300,000,000 | 300,000,000 |  |  |  |  |
Preferred stock, authorized | 50,000,000 |  |  |  | 50,000,000 |  |  |  | 50,000,000 | 50,000,000 |  |  |  |  |
Common stock, outstanding | 43,229,412 |  |  |  | 43,229,412 |  |  |  | 29,700,000 | 29,700,000 |  |  |  |  | 39,365,350
Reclassification of accumulated deficit to additional paid-in capital upon conversion from an LLC to a C Corporation |  |  |  |  | 32,000,000 |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Loss [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance | (119,820,000) |  | (118,778,000) |  | (121,229,000) |  | (120,845,000) |  | (120,845,000) | (40,195,000) |  |  |  |  |
Defined benefit plans, amounts reclassified from accumulated other comprehensive loss, net of tax | 1,425,000 | [1] | 2,000,000 | [1] | 2,834,000 | [1] | 4,067,000 | [1] | (384,000) | (80,650,000) | (3,293,000) |  |  |  |
Ending Balance | (118,395,000) |  | (116,778,000) |  | (118,395,000) |  | (116,778,000) |  | (121,229,000) | (120,845,000) | (40,195,000) |  |  |  |
Other comprehensive income, reclassification adjustment from AOCI, pension plans, tax | $ 878,000 |  | $ 0 |  | $ 1,748,000 |  | $ 0 |  |  |  |  |  |  |  |
Subsequent Events [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares, Issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 43,229,412
Common stock, outstanding after secondary offering and repurchase | 43,229,412 |  |  |  | 43,229,412 |  |  |  | 29,700,000 | 29,700,000 |  |  |  |  | 39,365,350
[1] | Represents amounts reclassified from accumulated other comprehensive loss. These amounts are included in the computation of net periodic pension cost. For additional information, see Note 6, Retirement and Benefit Plans.

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- Definition Reclassification of Accumulated Deficit to Additional Paid-In Capital Upon Conversion from an LLC to a C Corporation + References No definition available. + Details
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + 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=28358780&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e681-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + 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 210.5-02.29) -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 30 -Article 5 + Details
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