STOCK-BASED COMPENSATION (Details) (USD $)	3 Months Ended		9 Months Ended		87 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Dec. 31, 2011
Weighted Average Grant Price [Roll Forward]
Stock compensation expense			$ 1,491,000	$ 928,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights			The shares of restricted stock granted to employees and that are outstanding as of September 30, 2012 vest in accordance with one of the following vesting schedules: 100% one year after date of grant; 33.3% each year for three years after date of grant; 20% each year for five years after the grant date; or 10% each year for ten years after the grant date.
Numerator used for calculating the number of whole shares granted			75,000
Award vesting period			1 year
Number of shares authorized for grants (in shares)	800,000		800,000		800,000
Number of shares granted (in shares)			(76,416)		(688,371)
Number of shares forfeited (n shares)			6,860		67,598
Number of shares available for future grants (in shares)	179,227		179,227		179,227
Weighted-average grant price of granted shares (in dollars per share)			$ 38.99		$ 19.61
Restricted Stock [Roll Forward]
Non-vested, beginning balance (in shares)			228,592
Granted (in shares)			76,416		688,371
Forfeited (in shares)			(6,860)		(67,598)
Vested (in shares)			(57,067)
Nonvested, ending balance (in shares)	241,081		241,081		241,081
Weighted Average Grant Price [Roll Forward]
Non vested, beginning balance (in dollars per share)			$ 21.10
Granted (in dollars per share)			$ 38.99		$ 19.61
Forfeitures (in dollars per share)			$ 19.67
Vested (in dollars per share)			$ 18.21
Nonvested, ending balance (in dollars per share)	$ 27.52		$ 27.52		$ 27.52
Stock compensation expense	500,000	300,000	1,500,000	900,000
Unrecognized compensation expense	$ 5,450,000		$ 5,450,000		$ 5,450,000	$ 4,100,000
Compensation cost not yet recognized, Period for recognition			61 months