GOODWILL (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($)
Goodwill [Roll Forward]
Balance as of January 1, 2015	$ 57,417
Effect of net foreign currency exchange rate changes	(2,695)
Balance as of September 30, 2015	84,229
North America
Goodwill [Roll Forward]
Balance as of January 1, 2015	31,078
Effect of net foreign currency exchange rate changes	(341)
Balance as of September 30, 2015	49,782
Europe
Goodwill [Roll Forward]
Balance as of January 1, 2015	26,339
Effect of net foreign currency exchange rate changes	(2,354)
Balance as of September 30, 2015	34,447
Netsoft
Goodwill [Roll Forward]
Purchase accounting adjustments	30
Netsoft | North America
Goodwill [Roll Forward]
Purchase accounting adjustments	30
Netsoft | Europe
Goodwill [Roll Forward]
Purchase accounting adjustments	0
Jointech
Goodwill [Roll Forward]
Purchase accounting adjustments	6,181
Jointech | North America
Goodwill [Roll Forward]
Purchase accounting adjustments	0
Jointech | Europe
Goodwill [Roll Forward]
Purchase accounting adjustments	6,181
GGA
Goodwill [Roll Forward]
Purchase accounting adjustments	(4,807)
GGA | North America
Goodwill [Roll Forward]
Purchase accounting adjustments	(4,807)
GGA | Europe
Goodwill [Roll Forward]
Purchase accounting adjustments	0
Great Fridays Limited
Goodwill [Roll Forward]
Purchase accounting adjustments	4,281
Great Fridays Limited | North America
Goodwill [Roll Forward]
Purchase accounting adjustments	0
Great Fridays Limited | Europe
Goodwill [Roll Forward]
Purchase accounting adjustments	4,281
NavigationArts
Goodwill [Roll Forward]
Goodwill, Acquired During Period	23,822
NavigationArts | North America
Goodwill [Roll Forward]
Goodwill, Acquired During Period	23,822
NavigationArts | Europe
Goodwill [Roll Forward]
Goodwill, Acquired During Period	$ 0