Long-Term Debt (Interest Expense And Capitalized Interest) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Debt Instrument [Line Items]
Interest expense	$ 8,362	[1]	$ 12,578	[1]
Interest income	(717)		(316)
Capitalized interest	(3,162)		(1,939)
Net interest expense	4,483		10,323
Energy Resource Technology GOM, Inc [Member]
Debt Instrument [Line Items]
Interest expense			$ 2,800

[1] Interest expense of $2.8 million for the three-month period ended March 31, 2013 was allocated to ERT and is included in discontinued operations. Following the sale of ERT in February 2013, we ceased allocating interest expense to ERT, which then constituted a discontinued operation.