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6. Long-Term Debt (Details) (USD $)									6 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 Subordinated Debt [Member] Senior Subordinated Notes 8.0% [Member]	Dec. 31, 2011 Subordinated Debt [Member] Senior Subordinated Notes 8.0% [Member]	Sep. 30, 2012 Unsecured Debt [Member] Senior Notes 4.875% [Member]	Dec. 31, 2011 Unsecured Debt [Member] Senior Notes 4.875% [Member]	Sep. 30, 2012 Capital Lease Obligations [Member]	Dec. 31, 2011 Capital Lease Obligations [Member]	Jun. 30, 2010 Line of Credit [Member]	Sep. 30, 2012 Line of Credit [Member]
Debt Instrument [Line Items]
Long-term debt	$ 732,500,000	$ 732,300,000	$ 296,800,000	$ 296,300,000	$ 423,000,000	$ 422,800,000	$ 12,700,000	$ 13,200,000
Less current maturities	(300,000)	(600,000)
Line of credit maximum borrowing capacity										200,000,000
Percentage of capital stock of certain foreign subsidiaries securing part of Credit Agreement									65.00%
Outstanding borrowings										0
Long-term Debt, Excluding Current Maturities	$ 732,233,000	$ 731,698,000

X

- Definition

Percentage of Capital Stock Used to Secure Debt

+ References

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- Definition

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

+ References

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-Publisher SEC

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-Number 210

-Section 02

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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

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-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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

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