COMMITMENTS AND CONTINGENCIES (Tables)

12 Months Ended

Dec. 31, 2012

Commitments and Contingencies Disclosure [Abstract]

Schedule of future minimum rental payments for operating leases

As of December 31, 2012, future minimum lease commitments under non-cancelable operating leases, which will be expensed as direct costs (for contractor project space) and office and general expenses, were as follows:

2013	$	24,024
2014	18,837
2015	15,571
2016	13,926
2017	10,528
Thereafter	21,840
	$	104,726

Schedule of asset retirement obligations

The Company’s asset retirement obligations that are included in the Consolidated Balance Sheets as of December 31, 2012 and 2011 were as follows:

	As of December 31,
	2012		2011
Current portion of asset retirement obligations	$	52	$	301
Non-current portion of asset retirement obligations	2,769		2,507
Total asset retirement obligations	$	2,821	$	2,808