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Long-Term Bank Debt (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Jun. 30, 2011
Long-Term Bank Debt (Additional Textual) [Abstract]
Credit facility borrowing capacity	$ 250	$ 250
Maturity date of Amended and Restated Credit Agreement		Jul. 30, 2017
Increased in the borrowing base	125.0
Credit facility, interest rate description		The Company's borrowing rates in the credit facility provide for base rate loans at the prime rate (3.25% at June 30, 2012) plus applicable margin utilization rates that range from 1.00% to 2.0%, and LIBO rate loans at LIBO published rates plus applicable utilization rates (2.00% to 3.00% at June 30, 2012). As of June 30, 2012, the Company had in place one base rate loan and one LIBO rate loan with effective rates of 5.00% and 2.99%, respectively
Percentage for base rate loans at the prime rate	3.25%	3.25%
Minimum range for applicable margin utilization rate		1.00%
Maximum range for applicable margin utilization rate		2.00%
Debt instrument interest one base rate basis for effective rate	5.00%	5.00%
Effective LIBO loan rate	2.99%	2.99%
Credit facility current borrowing capacity	97.75	97.75
Weighted-average interest rate of borrowings	3.94%	3.94%
Credit facility remaining borrowing capacity	$ 27.25	$ 27.25
Debt instrument basis weighted average interest rate spread on variable rate		3.90%	5.67%
Maximum [Member]
Long-Term Bank Debt (Textual) [Abstract]
LIBO rate loans	3.00%	3.00%
Minimum [Member]
Long-Term Bank Debt (Textual) [Abstract]
LIBO rate loans	2.00%	2.00%

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Date the credit facility terminates, in CCYY-MM-DD format.

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Increase for additional borrowings on the credit facility during the period.

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Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

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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.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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