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Long-Term Debt (Term Loans) (Details) (USD $)					1 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 SUSP Term Loan [Member] Term Loan [Member]	Sep. 25, 2012 SUSP Term Loan [Member] Term Loan [Member]	Sep. 25, 2012 SUSP Term Loan [Member] Federal Funds Rate [Member] Term Loan [Member]	Sep. 25, 2012 SUSP Term Loan [Member] LIBOR [Member] Term Loan [Member]	Sep. 25, 2012 SUSP Term Loan [Member] LIBOR plus Federal Funds Rate or LIBOR plus Prime Rate [Member] Term Loan [Member]
Debt Instrument [Line Items]
Face amount			$ 180,700,000	$ 180,700,000
Basis spread on variable rate					0.50%	1.00%	0.25%
Interest rate at end of period			0.43%
Covenant collateral percentage amount			98.00%
Marketable securities	$ 37,936,000	$ 148,264,000

X

- Definition

Debt Instrument, Covenant, Percentage of Outstanding Principal Amount

+ References

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

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- Definition

The effective interest rate at the end of the reporting period.

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-SubTopic 30

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

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- Definition

Total debt and equity financial instruments including: (1) securities held-to-maturity and (2) securities available-for-sale that will be held for the long-term.

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