LONG-TERM DEBT LIABILITIES (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014
Debt Instrument [Line Items]
Total	$ 519,500,000		$ 482,000,000
Current amount of long-term debt	(3,000,000)		(3,000,000)
Unamortized original issue discount	(2,376,000)		(2,071,000)
Total long-term debt	514,124,000		476,929,000
Outstanding standby letter of credit	370,000		620,000
Stated interest rate percentage, senior unsecured debt			10.50%
Modification Accounting Of Bank Amendment New Deferred Financing Costs	1,000,000	1,100,000
Modification Accounting Of Bank Amendment Existing Deferred Financing Costs	6,800,000	9,000,000
Modification Accounting Of Bank Amendment Third Party Costs	100,000	100,000
Previous Credit Facility Financing Costs Written Off After Bank Amendment		700,000
Revolver, due November 23, 2016
Debt Instrument [Line Items]
Credit Facility	0		0
Term B Loan, due November 23, 2018
Debt Instrument [Line Items]
Credit Facility	299,500,000		262,000,000
Unsecured notes due December 1, 2019
Debt Instrument [Line Items]
Senior unsecured notes	$ 220,000,000		$ 220,000,000