Intangible Assets (Notes)

12 Months Ended

Dec. 31, 2012

Finite-Lived Intangible Assets, Net [Abstract]

Intangible Asset

INTANGIBLE ASSET

The intangible asset represents a right to receive, from the Ghana national grid, an amount of electric power equal to one fourth of a particular plant's power output over and above any rationing limit that might be imposed in the future by the Ghana national power authority. The intangible asset is being amortized over five years ending in 2014. As of December 31, 2012, the carrying value of the intangible asset was $3.2 million, with a gross asset value of $12.4 million and accumulated amortization of $9.3 million. We amortized $2.1 million during 2012 and expect the same for 2013 with the remaining amount amortized in 2014.