RELATED PARTY TRANSACTIONS (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Shares, Unvested, Beginning balance (in shares)	520,541
Shares, Granted (in shares)	602,710
Shares, Vested (in shares)	(94,335)
Shares, Forfeited (in shares)	(2,667)
Shares, Unvested, Ending balance (in shares)	1,026,249
Weighted-Average Grant-Date Fair Value, Unvested Beginning balance (in dollars)	$ 823,652
Weighted-Average Grant-Date Fair Value, Granted (in dollars)	1,088,350
Weighted-Average Grant-Date Fair Value, Vested (in dollars)	(218,144)
Weighted-Average Grant-Date Fair Value, Forfeited (in dollars)	(955)
Weighted-Average Grant-Date Fair Value, Unvested Ending balance (in dollars)	$ 1,692,904