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Long-Term Debt (Details Textual) (USD $)										6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 Must not exceed [Member]	Jun. 30, 2012 Must not be less than [Member]	Jun. 30, 2012 LIBOR plus [Member]	Jun. 30, 2012 Revolving credit loan [Member]	Jun. 30, 2012 Revolving credit loan [Member] Letters of credit [Member]	Jun. 30, 2012 Term loan [Member]	Dec. 31, 2011 Term loan [Member]	Jun. 30, 2012 Revolving credit loan and term loan [Member]
Long-Term Debt (Textual) [Abstract]
Revolving credit loan maximum commitment						$ 65,000,000
Term loan	120,168,311	126,733,619						65,341,595	71,906,903
Remaining commitments under the revolving credit loan facility						10,200,000
Sub-limit for letters of credit							5,000,000
Base interest rate for revolving credit loan and term loan facility					1.00%
Revolving credit loan and term loan carried interest	3.8021%	3.8125%
Revolving credit facility and term loan maturity date										Jul. 30, 2015
Total Debt Ratio			4.75
Interest Coverage Ratio				2.0
Fixed Charge Coverage Ratio				1.1
Maximum amount of undiscounted payments on default	$ 120,200,000

X

- Definition

Maximum total leverage ratio.

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No definition available.

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- Definition

Consolidated fixed charge coverage ratio.

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No definition available.

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- Definition

Minimum interest coverage ratio.

+ References

No definition available.

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- Details

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- Definition

Maximum amount of undiscounted payments on default.

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(2))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-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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- Definition

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

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

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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

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-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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- Definition

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

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-Publisher FASB

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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.

+ References

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

-Publisher FASB

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- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

+ References

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