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Level 4 Debt (Details) (USD $)	6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Debt [Line Items]
Long-term debt	$ 250,000,000		$ 275,000,000	$ 219,560,000
Interest paid	9,200,000	8,400,000	18,100,000	16,700,000	18,600,000
Asset-based revolving credit facility [Member]
Debt [Line Items]
Asset-based revolvoing credit facility	0		25,000,000	0
6.375% senior notes [Member]
Debt [Line Items]
6.375% senior notes, book value	$ 250,000,000		$ 250,000,000	$ 0
Interest rate	6.375%		6.375%

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

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-Topic 210

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-Section S99

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-Subparagraph (SX 210.5-02.22(a)(1))

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- Definition

The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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- Definition

Amount borrowed under the credit facility as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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