INCOME TAXES (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation from the tax computed at statutory income tax rates to the Company's income tax expense
Tax computed at statutory U.S. federal income tax rates									$ 32,068	$ 14,863	$ 20,050
Valuation allowance									832		5,250
Bargain purchase gain											(9,458)
Foreign tax reserve									2,359	556	(125)
State taxes									2,352	149	(21)
Research and development credit									(1,024)	(62)
Other, net									555	113	(975)
Total income tax expense	14,184	9,513	7,979	6,781	4,494	11,193	1,052	3,830	38,457	20,569	19,607
Guyana
Reconciliation from the tax computed at statutory income tax rates to the Company's income tax expense
Income taxes in excess (below) of statutory U.S. tax rates									812	2,096	3,351
Bermuda and Turks & Caicos
Reconciliation from the tax computed at statutory income tax rates to the Company's income tax expense
Income taxes in excess (below) of statutory U.S. tax rates									$ 503	$ 2,854	$ 1,535