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Discontinued Operations (Narrative) (Details) (USD $)	12 Months Ended			0 Months Ended	12 Months Ended
Discontinued Operations (Narrative) (Details) (USD $)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 02, 2009 Rio Grande [Member]	Dec. 31, 2009 Rio Grande [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale of Joint Venture Interest, Percentage Ownership Before Transaction				70.00%
Proceeds from Sale of Joint Venture Interest	$ 0	$ 0	$ 31,865,000	$ 35,000,000	$ 35,000,000
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	0	0	14,479,000		14,500,000
Net Cash Provided by (Used in) Discontinued Operations					$ 37,600,000

Gain (loss) after tax expense or benefit, not previously recognized and resulting from the sale of a business component, which is recognized at the date of sale. A gain (loss) reflects the amount by which the consideration received exceeds (is exceeded by) the net carrying amount (reflecting previous provisions for loss on disposal, if any) of the disposal group.

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