Details Of Certain Accounts (Other Current Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Details Of Certain Accounts [Abstract]
Other receivables	$ 737	$ 1,086
Prepaid insurance	4,337	11,999
Other prepaids	12,545	11,751
Spare parts inventory	2,589	2,480
Income tax receivable		14,201
Current deferred tax assets	34,397	43,942
Derivative assets		5,946
Other	6,584	5,529
Total other current assets	$ 61,189	$ 96,934