COMMITMENTS AND CONTINGENCIES (Details) (USD $)	12 Months Ended
	Dec. 31, 2014 Extension Facility	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2001
Finance Obligation [Abstract]
2015	$ 1,564,000
2016	1,564,000
2017	0
2018	0
2019	0
Thereafter	0
Finance Obligation, Total	3,128,000
Less amount representing interest	(3,128,000)
Finance obligation net of interest	0
Operating Leases [Abstract]
2015	19,666,000
2016	15,892,000
2017	14,843,000
2018	14,028,000
2019	12,077,000
Thereafter	23,760,000
Operating Leases, Total	100,266,000
Less amount representing interest	0
Operating leases net of interest	100,266,000
Capital Leases [Abstract]
Year Ending December 31, 2013	2,494,000
Year Ending December 31, 2014	2,556,000
Year Ending December 31, 2015	2,678,000
Year Ending December 31, 2016	2,678,000
Year Ending December 31, 2017	2,678,000
Thereafter	34,460,000
Capital Leases, Total	47,544,000
Less amount representing interest	(22,035,000)
Capital leases net of interest	25,509,000
Number of owned facilities	4
Net proceeds from sale and leaseback transaction	8,800,000
Lease Term	15 years
Number of lease extensions	2
Period considered for lease extension	10 years
Lease rent expense	20,500,000	21,100,000	21,300,000	1,200,000
Interest expense related to financing obligations	1,600,000	1,500,000	1,500,000
Loss contingency	1,000,000
Outstanding net loan commitment	24,100,000
Future employment contract commitments	5,000,000
Surety bonds	$ 15,100,000