FAIR VALUE MEASUREMENTS (Reconciliation of Beginning and Ending Balances of Liabilities Unobservable Inputs) (Details) (Call Option Derivative Liability [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Call Option Derivative Liability [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 0
Purchases, additions and issuances	10,808
Included in earnings	(198)
Transfers in and out of Level 3	0
Ending Balance	$ 10,610