Long-Term Debt (Interest Expense And Capitalized Interest) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended			3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013		Mar. 31, 2013 Energy Resource Technology GOM, Inc [Member]
Debt Instrument [Line Items]
Interest expense	$ 7,160	$ 13,977	$ 15,522	$ 26,555	[1]	$ 2,800
Interest income	(655)	(316)	(1,372)	(632)	[1]
Capitalized interest	(1,988)	(2,317)	(5,150)	(4,256)	[1]
Net interest expense	$ 4,517	$ 11,344	$ 9,000	$ 21,667	[1]

[1] Interest expense amount includes $2.8 million for the three-month period ended March 31, 2013 that 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.