LONG-TERM DEBT AND CAPITAL LEASE OBLIGATIONS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended		12 Months Ended		12 Months Ended				12 Months Ended		0 Months Ended	12 Months Ended			1 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Revolver Under Credit Agreement, Variable [Member]	Dec. 31, 2012 Revolver Under Credit Agreement, Variable [Member]	Dec. 31, 2013 Term Loan Under Credit Agreement, Variable [Member]	Dec. 31, 2012 Term Loan Under Credit Agreement, Variable [Member]	Dec. 31, 2013 Missouri IRBs [Member]	Dec. 31, 2012 Missouri IRBs [Member]	Dec. 31, 2013 Capital Leases [Member]	Dec. 31, 2012 Capital Leases [Member]	Aug. 07, 2012 Notes Payable [Member]	Dec. 31, 2013 Notes Payable [Member]	Dec. 31, 2012 Notes Payable [Member]	Dec. 31, 2013 Notes Payable to Prior Minority Shareholder [Member]	Dec. 31, 2012 Promissory Note to Finance Building [Member]	Mar. 28, 2013 Promissory Note to Finance Purchase of Corporate Aircraft [Member]
Debt Instrument [Line Items]
Long-term debt, gross			$ 36,000	$ 6,236	$ 222,750	$ 225,000	$ 7,756	$ 8,113	$ 14,572	$ 15,316	$ 1,000	$ 9,533	$ 6,034
Long-term debt, total	290,611	260,699
Current installments of long-term debt and capital lease obligations	5,242	5,632
Long-term debt and capital lease obligations, less current installments	285,369	255,067
Fixed interest rate (in hundredths)							2.80%				3.25%				2.95%	3.60%
Debt instrument, face amount														2,000	2,200	3,550
Fixed interest rate, minimum (in hundredths)	2.80%								2.04%	3.00%		2.45%
Fixed interest rate, maximum (in hundredths)	7.73%								7.73%	7.73%		3.60%	3.25%
Maturity dates			Dec. 28, 2017		Dec. 28, 2018						Aug. 31, 2013				Dec. 28, 2017
Period over which monthly installments due														36 months
Gross amount of assets recorded under capital leases	$ 17,845