Significant Accounting Policies (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2011
Significant Accounting Policies [Abstract]
Long-term restricted cash	$ 3,457	$ 3,721
Restricted cash, noncurrent	1,107	1,371
Cash collateral for insurance liabilities	2,350	2,350
Restatement Adjustment [Member]
Revision of prior period financial [Abstract]
Cost of Goods Sold, decrease			371
Gross Profit increase			371
Selling, General and Administrative Expense, increase			106
Other Income Increase Decrease			197
Provision for income tax increase			1,012
Earnings from continuing operations decreased			550
Income Or (Loss) from Continuing Operations, Per Diluted Share			$ 0.01
Diluted net earnings per share, decrease (in dollars per share)			$ 0.01
Out-of-period adjustments [Abstract]
Pre-Tax Earnings understated		542
Pre-Tax Earnings overstated	$ 542

Cost of goods sold increase or decrease during the reporting period.

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Gross profit increase or decrease during the reporting period.

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Increase or decrease of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest during the reporting period.

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The amount of net income (loss) derived from continuing operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Increase or decrease of other income during the reporting period.

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Amount pre-tax earnings were overstated in a previous reporting period.

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Amount that pre-tax earnings were understated in a previous reporting period.

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Selling, general and administrative expenses increase or decrease during the reporting period.

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Carrying amount as of the balance sheet date of cash collateral held for borrowed securities, for which the cash is restricted as to withdrawal or usage.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Per share amount effect of a restatement of results of operations on diluted earnings per share.

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The component of income tax expense representing amounts paid or payable (or refundable) which are classified as "income taxes" as determined by applying the provisions of enacted tax law to other than the taxable Income or Loss from continuing operations for the period. Items affecting income taxes and required to be disclosed, but not included elsewhere, would also be designated as "Other".

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Cash and equivalents whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements.

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