Details Of Certain Accounts (Other Current Assets) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Details Of Certain Accounts [Abstract]
Other receivables	$ 568	$ 5,096
Prepaid insurance	19,830	12,701
Other prepaids	15,861	13,271
Spare parts inventory	15,324	18,066
Current deferred tax assets	48,447	41,449
Hedging assets (Note 16)	7,510	21,579
Gas and oil imbalance	3,740	5,134
Income tax receivable	10,135
Assets held for sale (Note 14)	5,000
Other	5,482	4,325
Total other current assets	$ 131,897	$ 121,621