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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 |  |

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