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Income Taxes (Details) (USD $)	3 Months Ended
Income Taxes (Details) (USD $)	Mar. 31, 2013	Mar. 31, 2012
Income Taxes
Income tax expense (benefit)	$ 44,091,000	$ 16,286,000
Income (loss) before income taxes	64,185,000	(21,255,000)
Effective tax rate (as a percent)	69.00%	(77.00%)
Material unrecognized income tax benefits	0
Bermuda
Income Taxes
Income (loss) before income taxes	(6,777,000)	(3,168,000)
United States
Income Taxes
Income (loss) before income taxes	2,370,000	3,312,000
Effective tax rate (as a percent)	37.00%	38.00%
Foreign-other
Income Taxes
Income (loss) before income taxes	$ 68,592,000	$ (21,399,000)
Effective tax rate (as a percent)	0.00%
Statutory rate (as a percent)	0.00%
Ghana
Income Taxes
Effective tax rate (as a percent)	37.00%	34.00%

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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