PENSIONS (Details) (USD $)	12 Months Ended
Dec. 31, 2012 Employee	Dec. 31, 2011 Employee	Dec. 31, 2010
Defined contribution scheme:
Defined contribution scheme, charge to net income	$ 800,000	$ 800,000	$ 500,000
Number of Norwegian employees	10	13
Pensions
Defined benefit schemes:
Number of defined benefit schemes	2
Accumulated other comprehensive income, net actuarial loss	17,809,000	15,486,000
Other comprehensive income, tax on actuarial loss	$ 300,000	$ 400,000	$ 0

The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

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Tax effect of the increase (decrease) in the value of the projected benefit obligation and the (increase) decrease in the value of the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption that has not been recognized in net periodic benefit cost.

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