LONG-TERM DEBT AND CAPITAL LEASE OBLIGATIONS, LINE OF CREDIT FACILTY (Details) (USD $)	12 Months Ended
	Dec. 31, 2012
Line of Credit Facility [Line Items]
Mandatory prepayments description	The maturity dates are subject to acceleration upon breach of the financial covenants (consisting of a maximum total leverage ratio and senior leverage ratio and a minimum fixed charge coverage ratio) and other customary non-financial covenants contained in the credit agreement
Long-term Debt, Fiscal Year Maturity [Abstract]
Year ending December 31, 2013	$ 4,691,000
Year ending December 31, 2014	3,766,000
Year ending December 31, 2015	3,789,000
Year ending December 31, 2016	3,145,000
Year ending December 31, 2017	9,405,000
Thereafter	220,587,000
Long-term debt, total	245,383,000
Less Imputed Interest - Debt	0
Long-term Debt, five year maturities	245,383,000
Capital Leases, Fiscal Year Maturity [Abstract]
Year ending December 31, 2013	1,484,000
Year ending December 31, 2014	1,626,000
Year ending December 31, 2015	1,857,000
Year ending December 31, 2016	1,856,000
Year ending December 31, 2017	1,872,000
Thereafter	10,010,000
Capital Leases, Total	18,705,000
Less: imputed interest	(3,389,000)
Total Capital leases, five year maturities	15,316,000
Line of Credit [Member]
Line of Credit Facility [Line Items]
Minimum outstanding debt required to be hedge to a fixed rate (in hundredths)	50.00%
Minimum outstanding debt hedging period	3 years
Credit Agreement [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Variable rate floor (in hundredths)	1.25%
Credit Agreement [Member] | Alternate base rate [Member]
Line of Credit Facility [Line Items]
Variable rate floor (in hundredths)	2.25%
Credit Agreement [Member] | Federal Funds Rate [Member]
Line of Credit Facility [Line Items]
Spread over reference rate (in hundredths)	0.50%
Credit Agreement [Member] | One Month Eurodollar [Member]
Line of Credit Facility [Line Items]
Spread over reference rate (in hundredths)	1.00%
Credit Agreement [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Commitment fee (in hundredths)	0.25%
Credit Agreement [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Commitment fee (in hundredths)	0.625%
Credit Agreement [Member] | Maximum [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Spread over reference rate (in hundredths)	4.75%
Credit Agreement [Member] | Maximum [Member] | Alternate base rate [Member]
Line of Credit Facility [Line Items]
Spread over reference rate (in hundredths)	3.75%
Missouri IRBs [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Maturity dates	Sep. 30, 2020
Missouri IRBs [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Maturity dates	Jun. 30, 2032
Term Loan Under Credit Agreement, Variable [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity	225,000,000
Maturity dates	Dec. 28, 2018
Revolver Under Credit Agreement, Variable [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 75,000,000
Maturity dates	Dec. 28, 2017