LONG TERM DEBT (Details) (USD $)			9 Months Ended		3 Months Ended				3 Months Ended			3 Months Ended				9 Months Ended		3 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 On or prior to November 15, 2013	Sep. 30, 2013 The period prior to November 15, 2014.	Jun. 30, 2013 Revolving Credit Facility	Sep. 30, 2013 Revolving Credit Facility	Dec. 31, 2012 Revolving Credit Facility	Sep. 30, 2013 Standby letters of credit	Sep. 30, 2013 Term Loan	Jun. 30, 2013 Term Loan	Dec. 31, 2012 Term Loan	Sep. 30, 2013 Term Loan Minimum	Sep. 30, 2013 Term Loan Maximum	Sep. 30, 2013 7.125% Senior Notes due 2018	Dec. 31, 2012 7.125% Senior Notes due 2018	Sep. 30, 2013 Subordinated seller notes, non-collateralized, net of unamortized discount with principal and interest payable in either monthly, quarterly or annual installments at effective interest rates ranging from 2.00% to 4.00%, maturing through November 2018	Dec. 31, 2012 Subordinated seller notes, non-collateralized, net of unamortized discount with principal and interest payable in either monthly, quarterly or annual installments at effective interest rates ranging from 2.00% to 4.00%, maturing through November 2018	Jun. 30, 2013 New credit agreement	Jun. 30, 2013 New credit agreement Minimum	Jun. 30, 2013 New credit agreement Maximum	Jun. 30, 2013 Previous credit agreement
Long-Term Debt
Total Debt	$ 471,057,000	$ 520,646,000				$ 26,000,000	$ 0		$ 223,594,000		$ 293,300,000			$ 200,000,000	$ 200,000,000	$ 21,463,000	$ 27,346,000
Less current portion	(13,673,000)	(11,082,000)
Long Term Debt	457,384,000	509,564,000
Interest rate stated percentage														7.125%
Interest rate, minimum (as a percent)																2.00%
Interest rate, maximum (as a percent)																4.00%
Term of agreement																		5 years
Maximum borrowing capacity					200,000,000					225,000,000								425,000,000			400,000,000
Interest, base rate					LIBOR					LIBOR
Interest rate margin (as a percent)					1.75%					1.75%
Pre-tax non-cash charge related to the write-off of existing debt issuance costs associated with its previous credit agreement																		6,600,000
Prepayment penalties																		0
Balance available under the credit facility						170,400,000
Amounts outstanding under the credit facility						26,000,000
Amount outstanding								3,600,000
Quarterly principal payment percentage												0.625%	3.75%
Mandatory prepayment									$ 0
Maximum percentage of the aggregate principal amount up to which the notes may be redeemed			35.00%
Percentage of the aggregate principal amount at which the notes may be redeemed			107.125%	103.60%
Consolidated interest coverage ratio																			3.50
Total leverage ratio																				4.00