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Investments in Unconsolidated Affiliates (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Summarized financial data for investment in unconsolidated affiliates
U.S. oil and gas joint venture earnings (losses)	$ (400)	$ (2,900)	$ (600)	$ (2,400)	$ (1,600)	$ (2,600)	$ 1,400	$ 2,900	$ (6,301)	$ 39	$ (288,718)
Impairment charges for unconsolidated oil and gas joint ventures included in continuing operations									6,974
Joint Venture in Saudi Arabia
Investments in unconsolidated affiliates
Ownership percentage											51.00%
Assets Held-for-sale
Summarized financial data for investment in unconsolidated affiliates
Current assets	470,501				442,703				470,501	442,703
Long-term assets	324,234				138,222				324,234	138,222
Current liabilities	467,000				440,585				467,000	440,585
Long-term liabilities	207,681				4,169				207,681	4,169
Gross revenues									605,179	562,101	657,362
Gross margin									35,370	46,446	107,035
Net income (loss)									(642)	1,088	(624,172)
U.S. oil and gas joint venture earnings (losses)									$ (6,301)	$ 39	$ (288,718)