Details Of Certain Accounts (Other Current Assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Details Of Certain Accounts [Abstract]
Other receivables	$ 5,096	$ 1,247
Prepaid insurance	12,701	12,375
Other prepaids	13,271	11,623
Spare parts inventory	18,066	25,333
Current deferred tax assets	41,449	49,200
Hedging assets	21,579	5,472
Income tax receivable		6,099
Gas and oil imbalance	5,134	6,001
Other	4,325	5,715
Other current assets	$ 121,621	$ 123,065