ASSETS AND LIABILITIES MEASURED AT FAIR VALUE (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
		Dec. 31, 2014		Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013	[6]
Liabilities at Fair Value [Abstract]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	[1]					$ (793)
Gain (Loss) on Sale of Notes Receivable				$ 0	[2]	0
Impairment loss on intangible assets				0	[3]	0	[4]
Impairment loss on goodwill		$ 26,439		0	[5]	26,439	[6]	$ 73,528
Non-recurring Fair Value Measurement [Member]
Assets at Fair Value [Abstract]
Intangible assets, net		50,940	[4]	46,582	[3]	50,940	[4]
Goodwill		86,784	[6]	86,784	[5]	86,784	[6]
Non-recurring Fair Value Measurement [Member] | Level 1 [Member]
Assets at Fair Value [Abstract]
Intangible assets, net		0	[4]	0	[3]	0	[4]
Goodwill		0	[6]	0	[5]	0	[6]
Non-recurring Fair Value Measurement [Member] | Level 2 [Member]
Assets at Fair Value [Abstract]
Intangible assets, net		0	[4]	0	[3]	0	[4]
Goodwill		0	[6]	0	[5]	0	[6]
Non-recurring Fair Value Measurement [Member] | Level 3 [Member]
Assets at Fair Value [Abstract]
Intangible assets, net		50,940	[4]	46,582	[3]	50,940	[4]
Goodwill		86,784	[6]	86,784	[5]	86,784	[6]
Interest Rate Derivatives [Member] | Recurring Fair Value Measurement [Member]
Liabilities at Fair Value [Abstract]
Interest rate derivatives	[1]	0				0
Notes Payable, Fair Value Disclosure		245,000	[7]	234,175	[2]	245,000	[7]
Interest Rate Derivatives [Member] | Recurring Fair Value Measurement [Member] | Level 1 [Member]
Liabilities at Fair Value [Abstract]
Interest rate derivatives	[1]	0				0
Notes Payable, Fair Value Disclosure		0	[7]	0	[2]	0	[7]
Interest Rate Derivatives [Member] | Recurring Fair Value Measurement [Member] | Level 2 [Member]
Liabilities at Fair Value [Abstract]
Interest rate derivatives	[1]	0				0
Notes Payable, Fair Value Disclosure		0	[7]	234,175	[2]	0	[7]
Interest Rate Derivatives [Member] | Recurring Fair Value Measurement [Member] | Level 3 [Member]
Liabilities at Fair Value [Abstract]
Interest rate derivatives	[1]	0				0
Notes Payable, Fair Value Disclosure		$ 245,000	[7]	$ 0	[2]	$ 245,000	[7]

[1] In 2014, the Company terminated and settled its interest rate derivatives in conjunction with the settlement of its then existing credit agreement

[2] The fair value of the Company's senior secured notes was determined using the last market price transaction in the year ended December 31, 2015 of 100%

[3] The fair values of intangibles relating to the 2012 acquisitions of TASS and Valent were determined by third parties in connection with the purchase and recorded at those values.

[4] The fair values of intangibles relating to the 2012 acquisitions of TASS and Valent were determined by third parties in connection with the purchase and recorded at those values.

[5] The Company performed its annual impairment analysis of goodwill during the fourth quarter of 2015 and determined no adjustments to the carrying value were necessary.

[6] During the fourth quarter of 2014, the Company performed its annual impairment analysis of goodwill. As a result of the analysis, the goodwill related to the Engineering Services reporting unit was deemed impaired, and a $26,439 impairment charge was recorded in the Consolidated Statements of Comprehensive Income (Loss) for the year ended December 31, 2014.

[7] The Company's senior secured notes were outstanding but not registered at December 31, 2014. Using a qualitative approach, the Company determined the fair value of the notes at December 31, 2014 was equal to the amount for which they were issued.