FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 2) (Fair Value, Measurements, Recurring, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Embedded derivative liabilities
Reconciliation of the beginning and ending balances for major liability categories measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Beginning balance	$ (3,392)		$ (3,655)
Total gains or (losses) for the period:
Included in earnings	(20)	[1]	257	[1]
Ending balance	(3,412)		(3,398)
Changes in unrealized losses included in earnings relating to assets and liabilities held at period-end	20		(257)
Corporate debt securities | Non-investment grade
Reconciliation of the beginning and ending balances for major asset categories measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Beginning balance	6,528		6,371
Total gains or (losses) for the period:
Included in earnings	960	[1]
Included in other comprehensive income (unrealized)	922	[2]	434	[2]
Purchases, issues, sales, settlements:
Sales	(7,219)
Settlements	(98)		(88)
Transfers in and/or out of Level 3	(1,093)
Ending balance			$ 6,717

[1] Realized gains or losses of corporate debt securities and embedded derivative liabilities are included in net gains on sales of investment securities and other operating expense, respectively, in the consolidated statements of income.

[2] Unrealized gains or losses on available-for-sale investment securities are reported in other comprehensive income, net of tax, in the consolidated statements of comprehensive income.