STOCK-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2013

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Share Based Compensation Expense

The table below sets forth the total amount of stock-based compensation expense for the six months and quarters ended June 30, 2013 and 2012.

	Quarter Ended				Six Months Ended
	June 30,				June 30,
	2013		2012		2013		2012
	(Thousands of dollars)
Stock-based compensation expense:
Time-based restricted units	$	113	$	731	$	222	$	731
Performance-based restricted units		486		—		777		—
Total stock-based compensation expense	$	599	$	731	$	999	$	731