ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31	$ (13,046,000)
Net current period other comprehensive income	5,266,000	(13,399,000)
Balance as of March 31	(7,697,000)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	600,000	800,000
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31	(20,352,000)	(25,073,000)
Other comprehensive income before reclassifications, net of tax provision related to unrealized gains on available-for-sale securities	5,220,000	(6,951,000)
Amounts reclassified from accumulated other comprehensive income	0	0
Net current period other comprehensive income	5,220,000	(6,951,000)
Balance as of March 31	(15,132,000)	(32,024,000)
Unrealized Gains On Available-For-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31	7,306,000	(7,096,000)
Other comprehensive income before reclassifications, net of tax provision related to unrealized gains on available-for-sale securities	129,000	(4,975,000)
Amounts reclassified from accumulated other comprehensive income	0	(1,000)
Net current period other comprehensive income	129,000	(4,976,000)
Balance as of March 31	7,435,000	(12,072,000)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31	(13,046,000)	(32,169,000)
Other comprehensive income before reclassifications, net of tax provision related to unrealized gains on available-for-sale securities	5,349,000	(11,926,000)
Amounts reclassified from accumulated other comprehensive income	0	(1,000)
Net current period other comprehensive income	5,349,000	(11,927,000)
Balance as of March 31	$ (7,697,000)	$ (44,096,000)