ACQUISITIONS (Earnout Obligation) (Details) - USD ($) $ in Thousands							3 Months Ended	12 Months Ended
	Nov. 16, 2015	Jul. 10, 2015	Oct. 31, 2014	Jun. 06, 2014	Apr. 30, 2014	Mar. 05, 2014	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Cash, Net of Working Capital and Other Adjustments, Deferred								$ 2,260	$ 30,274	$ 4,000
2015 Acquisitions | NavigationArts
Business Acquisition [Line Items]
Cash, Net of Working Capital and Other Adjustments, Paid		$ 28,747
Cash, Net of Working Capital and Other Adjustments, Deferred							$ 1,797
2015 Acquisitions | AGS
Business Acquisition [Line Items]
Cash, Net of Working Capital and Other Adjustments, Paid	$ 51,717
2014 Acquisition
Business Acquisition [Line Items]
Cash, Net of Working Capital and Other Adjustments, Paid										38,072
Cash, Net of Working Capital and Other Adjustments, Deferred										5,022
Recorded Earnout Payable, Cash										29,398
Recorded Earnout Payable, Stock										5,000
Total Recorded Purchase Price										$ 80,280
2014 Acquisition | Common Stock
Business Acquisition [Line Items]
Common Shares, Issued (in shares)										0
Common Shares, Deferred (in shares)										89,552
Fair Value of Common Shares, Issued										$ 0
Fair Value of Common Shares, Deferred										$ 2,788
2014 Acquisition | Netsoft
Business Acquisition [Line Items]
Cash, Net of Working Capital and Other Adjustments, Paid						$ 2,403
Cash, Net of Working Capital and Other Adjustments, Deferred						1,022
Recorded Earnout Payable, Cash						1,825
Recorded Earnout Payable, Stock						0
Total Recorded Purchase Price						$ 5,250
2014 Acquisition | Netsoft | Common Stock
Business Acquisition [Line Items]
Common Shares, Issued (in shares)						0
Common Shares, Deferred (in shares)						0
Fair Value of Common Shares, Issued						$ 0
Fair Value of Common Shares, Deferred						0
2014 Acquisition | Netsoft | Maximum
Business Acquisition [Line Items]
Maximum Potential Earnout Payable						$ 1,825
2014 Acquisition | Jointech
Business Acquisition [Line Items]
Cash, Net of Working Capital and Other Adjustments, Paid					$ 10,000
Cash, Net of Working Capital and Other Adjustments, Deferred					4,000
Recorded Earnout Payable, Cash					15,000
Recorded Earnout Payable, Stock					5,000
Total Recorded Purchase Price					$ 36,788
2014 Acquisition | Jointech | Common Stock
Business Acquisition [Line Items]
Common Shares, Issued (in shares)					0
Common Shares, Deferred (in shares)					89,552
Fair Value of Common Shares, Issued					$ 0
Fair Value of Common Shares, Deferred					2,788
2014 Acquisition | Jointech | Maximum
Business Acquisition [Line Items]
Maximum Potential Earnout Payable					$ 20,000
2014 Acquisition | GGA
Business Acquisition [Line Items]
Cash, Net of Working Capital and Other Adjustments, Paid				$ 14,892
Cash, Net of Working Capital and Other Adjustments, Deferred				0
Recorded Earnout Payable, Cash				11,400
Recorded Earnout Payable, Stock				0
Total Recorded Purchase Price				$ 26,292
2014 Acquisition | GGA | Common Stock
Business Acquisition [Line Items]
Common Shares, Issued (in shares)				0
Common Shares, Deferred (in shares)				0
Fair Value of Common Shares, Issued				$ 0
Fair Value of Common Shares, Deferred				$ 0
2014 Acquisition | Great Fridays
Business Acquisition [Line Items]
Cash, Net of Working Capital and Other Adjustments, Paid			$ 10,777
Cash, Net of Working Capital and Other Adjustments, Deferred			0
Recorded Earnout Payable, Cash			1,173
Recorded Earnout Payable, Stock			0
Total Recorded Purchase Price			$ 11,950
2014 Acquisition | Great Fridays | Common Stock
Business Acquisition [Line Items]
Common Shares, Issued (in shares)			0
Common Shares, Deferred (in shares)			0
Fair Value of Common Shares, Issued			$ 0
Fair Value of Common Shares, Deferred			0
2014 Acquisition | Great Fridays | Maximum
Business Acquisition [Line Items]
Maximum Potential Earnout Payable			$ 1,173