SEGMENT INFORMATION (Segment Reporting) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Revenue	$ 77,127	$ 78,305	$ 73,733	$ 78,035	$ 82,261	$ 72,756	$ 63,464	$ 63,653	$ 307,200	$ 282,134	$ 250,080
Gross profit	10,675	$ 10,347	$ 7,011	$ 8,388	9,716	$ 3,159	$ 5,312	$ 6,117	36,421	24,304	30,472
Depreciation									12,250	13,261	10,379
Capital expenditures									3,797	7,722	11,661
Total assets	106,808				114,804				106,808	114,804	93,793
Domestic [Member] | Reportable Geographical Components [Member]
Segment Reporting Information [Line Items]
Revenue									186,061	169,945	130,574
Gross profit									12,392	11,614	12,940
Depreciation									7,748	8,049	5,929
Capital expenditures									3,291	4,382	7,825
Total assets	59,612				67,927				59,612	67,927	53,635
Offshore [Member] | Reportable Geographical Components [Member]
Segment Reporting Information [Line Items]
Revenue									76,868	72,914	85,785
Gross profit									16,607	6,672	15,192
Depreciation									3,678	4,232	3,414
Capital expenditures									287	3,049	2,718
Total assets	36,503				38,016				36,503	38,016	34,953
Nearshore [Member] | Reportable Geographical Components [Member]
Segment Reporting Information [Line Items]
Revenue									44,271	39,275	33,721
Gross profit									7,422	6,018	2,340
Depreciation									824	980	1,036
Capital expenditures									219	291	1,118
Total assets	$ 10,693				$ 8,861				$ 10,693	$ 8,861	$ 5,205