Details of Certain Accounts (Other Current Assets) (Details) (USD $) In Thousands, except Share data	3 Months Ended			6 Months Ended
	Mar. 31, 2011	Dec. 31, 2010		Jun. 30, 2011		Jun. 30, 2010
Details of Certain Accounts
Other receivables		$ 1,247		$ 854
Prepaid insurance		12,375		12,141
Other prepaids		11,623		12,692
Spare parts inventory		25,333		21,850
Current deferred tax assets		49,200		37,533
Hedging assets		5,472		5,988
Gas imbalance		6,001		5,961
Income tax receivable		6,099		9,059
Investment held for sale		2,835	[1]	0	[1]
Other		2,880		4,256
Other current assets		123,065		110,334
Sale of subsidiary/equity method investee shares by parent company	500,000
Proceeds from sale of Cal Dive common stock				3,588		0
Gain on sale of Cal Dive common stock		(2,200)		753		0
Pre-tax gain on sale of Cal Dive common stock	$ 800			$ 753		$ 0

[1] In March 2011, we sold our remaining 500,000 shares of Cal Dive common stock. These sales transactions resulted in net proceeds of approximately $3.6 million and a pre-tax gain of $0.8 million. In the fourth quarter of 2010, we recognized a $2.2 million other than temporary loss on our investment in Cal Dive common shares (see Notes 2 and 3 of our 2010 Form 10-K for additional information regarding our former Investment in Cal Dive common stock).