ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at January 1	$ (13,046,000)
Net current period other comprehensive income	(75,465,000)	22,795,000	(19,115,000)
Balance at December 31	(87,700,000)	(13,046,000)
Tax provision for Other comprehensive income before reclassifications	700,000	3,900,000
Tax provision for Amounts reclassified from accumulated other comprehensive loss	1,200,000	6,900,000
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at January 1	(20,352,000)	(25,073,000)
Other comprehensive income before reclassifications, net of tax provision of $3.9 million related to unrealized gains on available-for-sale securities	(66,496,000)	4,721,000
Amounts reclassified related to unrealized gains on available-for-sale securities, net of tax provision of $6.9 million	0	0
Net current period other comprehensive income	(66,496,000)	4,721,000
Balance at December 31	(86,848,000)	(20,352,000)
Unrealized (Losses) Gains On Available-For-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at January 1	7,306,000	(7,096,000)
Other comprehensive income before reclassifications, net of tax provision of $3.9 million related to unrealized gains on available-for-sale securities	(6,233,000)	43,235,000
Amounts reclassified related to unrealized gains on available-for-sale securities, net of tax provision of $6.9 million	(1,925,000)	(28,833,000)
Net current period other comprehensive income	(8,158,000)	14,402,000
Balance at December 31	(852,000)	7,306,000
Accumulated Other Comprehensive (Loss) Income
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at January 1	(13,046,000)	(32,169,000)
Other comprehensive income before reclassifications, net of tax provision of $3.9 million related to unrealized gains on available-for-sale securities	(72,729,000)	47,956,000
Amounts reclassified related to unrealized gains on available-for-sale securities, net of tax provision of $6.9 million	(1,925,000)	(28,833,000)
Net current period other comprehensive income	(74,654,000)	19,123,000
Balance at December 31	(87,700,000)	(13,046,000)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Income			$ 2,100,000