LONG-TERM DEBT (Details)		3 Months Ended
	May. 12, 2016 USD ($)	Mar. 31, 2016 USD ($) Covenant	Dec. 31, 2015 USD ($)
Borrowings [Abstract]
Long-term debt		$ 363,521,000	$ 349,509,000
Less unamortized debt issuance costs		(1,321,000)	(2,046,000)
Less: Current portion		(363,521,000)	(50,829,000)
Long-term debt, less current maturities		0	298,680,000
Line of Credit [Member]
Borrowings [Abstract]
Long-term debt		198,139,000	172,147,000
Term Loan [Member]
Borrowings [Abstract]
Long-term debt		162,500,000	175,000,000
Promissory Note Payable [Member]
Borrowings [Abstract]
Long-term debt		$ 4,203,000	$ 4,408,000
Interest rate		2.90%	2.90%
Wells Fargo Bank, National Association [Member] | Term Loan [Member]
Borrowings [Abstract]
Maximum borrowing capacity		$ 250,000,000
Amount outstanding		$ 162,500,000
Wells Fargo Bank, National Association [Member] | Revolving Credit Facility [Member]
Borrowings [Abstract]
Number of financial covenants under the facility | Covenant		2
Maximum cash balance calculated on average thirty day balance		$ 3,000,000
Maximum borrowing capacity		$ 350,000,000
Commitment fee		0.50%
Amount outstanding		$ 360,600,000
Debt amortization expenses payable per quarter current year		12,500,000
Debt amortization expenses payable per quarter in year two and thereafter		$ 15,625,000
Consolidated leverage ratio		4.00
Weighted average interest rate		2.69%
Available for borrowing under the facility		$ 22,300,000
Expiration date		Jan. 02, 2019
Wells Fargo Bank, National Association [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member]
Borrowings [Abstract]
Decrease in borrowing capacity	$ (100,000,000)
Maximum borrowing capacity	$ 250,000,000
Wells Fargo Bank, National Association [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Borrowings [Abstract]
Minimum asset coverage ratio		0.90
Commitment fee		0.20%
Wells Fargo Bank, National Association [Member] | Revolving Credit Facility [Member] | Maximum [Member]
Borrowings [Abstract]
Minimum asset coverage ratio		1.00
Commitment fee		0.50%
Wells Fargo Bank, National Association [Member] | Revolving Credit Facility [Member] | LIBOR [Member]
Borrowings [Abstract]
Base rate		LIBOR
Basis spread on base rate		2.25%
Wells Fargo Bank, National Association [Member] | Revolving Credit Facility [Member] | LIBOR [Member] | Subsequent Event [Member]
Borrowings [Abstract]
Basis spread on base rate	3.25%
Wells Fargo Bank, National Association [Member] | Revolving Credit Facility [Member] | LIBOR [Member] | Minimum [Member]
Borrowings [Abstract]
Basis spread on base rate		1.75%
Wells Fargo Bank, National Association [Member] | Revolving Credit Facility [Member] | LIBOR [Member] | Maximum [Member]
Borrowings [Abstract]
Basis spread on base rate		3.25%
Wells Fargo Bank, National Association [Member] | Revolving Credit Facility [Member] | Prime rate [Member]
Borrowings [Abstract]
Basis spread on base rate		1.25%
Wells Fargo Bank, National Association [Member] | Revolving Credit Facility [Member] | Prime rate [Member] | Subsequent Event [Member]
Borrowings [Abstract]
Basis spread on base rate	2.25%
Wells Fargo Bank, National Association [Member] | Revolving Credit Facility [Member] | Prime rate [Member] | Minimum [Member]
Borrowings [Abstract]
Basis spread on base rate		0.75%
Wells Fargo Bank, National Association [Member] | Revolving Credit Facility [Member] | Prime rate [Member] | Maximum [Member]
Borrowings [Abstract]
Basis spread on base rate		2.25%