Details Of Certain Accounts (Other Current Assets) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Details Of Certain Accounts [Abstract]
Other receivables	$ 856	$ 1,086
Prepaid insurance	10,224	11,999
Other prepaids	12,066	11,751
Spare parts inventory	3,423	2,480
Income tax receivable		14,201
Current deferred tax assets	45,711	43,942
Derivative assets	6	5,946
Other	8,194	5,529
Total other current assets	$ 80,480	$ 96,934