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Debt (Details Textual) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Senior Notes 2015 [Member]
Debt (Textual) [Abstract]
Senior Notes	6.05%
Aggregate principal amount	$ 75,000
Unaccrued discount	71	92
Imputed rate	6.10%
Senior notes, maturity period	2015
Senior Notes 2016 [Member]
Debt (Textual) [Abstract]
Senior Notes	6.85%
Aggregate principal amount	125,000
Unaccrued discount	$ 136	$ 164
Imputed rate	6.90%
Senior notes, maturity period	2016

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Debt instrument imputed interest rate.

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- Definition

The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

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

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 30

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Interest rate stated in the contractual debt agreement.

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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