Other Current Assets (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2010
Other current assets
Deferred tax assets	$ 41,774		$ 0
Income tax recoverable	9,855		29,957
Assets held for sale	0	8,139	8,155
Other	13,805		18,245
Total	65,434		56,357
Other Current Assets (Textual) [Abstract]
Carrying value of assets held for sale current	$ 0	$ 8,139	$ 8,155

- Definition

The current portion of the aggregate tax effects as of the balance sheet date of all future tax deductions arising from temporary differences between tax basis and generally accepted accounting principles basis recognition of assets, liabilities, revenues and expenses, which can only be deducted for tax purposes when permitted under enacted tax laws; after deducting the allocated valuation allowance, if any, to reduce such amount to net realizable value. Deferred tax liabilities and assets are classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. A deferred tax liability or asset that is not related to an asset or liability for financial reporting, including deferred tax assets related to carryforwards, are classified according to the expected reversal date of the temporary difference. An unrecognized tax benefit that is directly related to a position taken in a tax year that results in a net operating loss carryforward is presented as a reduction of the related deferred tax asset.

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