FAIR VALUE MEASUREMENTS - Schedule of Fair Value Hierarchy (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	$ 1,258	$ 185
Non-marketable securities	3,384	4,383
Total assets	4,642	4,568
Derivative liabilities	0	938
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	1,258	185
Non-marketable securities	0	0
Total assets	1,258	185
Derivative liabilities	0	938
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0
Non-marketable securities	3,384	4,383
Total assets	3,384	4,383
Derivative liabilities	$ 0	$ 0