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Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
--- | ---
Jul. 31, 2013 | Jul. 31, 2012
Income Statement [Abstract] |  |
Revenues | $ 128,558 | $ 117,638
Operating expenses: |  |
Cost of operations | 88,419 | 81,345
General and administration | 15,078 | 15,190
Depreciation and amortization | 15,197 | 14,709
Expense from divestiture, acquisition and financing costs | 20 | 553
Severance and reorganization costs | 107 | 34
Total operating expenses | 118,821 | 111,831
Operating income | 9,737 | 5,807
Other expense (income): |  |
Interest income | (12) | (8)
Interest expense | 9,359 | 11,692
Loss from equity method investments | 977 | 1,766
Gain on derivative instruments | (654) |
Other income | (138) | (130)
Other expense, net | 9,532 | 13,320
Income (loss) from continuing operations before income taxes and discontinued operations | 205 | (7,513)
Provision for income taxes | 319 | 650
Loss from continuing operations before discontinued operations | (114) | (8,163)
Discontinued operations: |  |
Income (loss) from discontinued operations (net of income tax provision of $0 and $0) | 329 | (216)
Loss on disposal of discontinued operations (net of income tax provision of $0 and $0) | (378) |
Net loss | (163) | (8,379)
Less: Net income (loss) attributable to noncontrolling interests | 28 | (8)
Net loss attributable to common stockholders | (191) | (8,371)
Amounts attributable to common stockholders: |  |
Loss from continuing operations before discontinued operations | (142) | (8,155)
Income (loss) from discontinued operations, net of tax | 329 | (216)
Loss on disposal of discontinued operations, net of tax | (378) |
Net loss attributable to common stockholders | $ (191) | $ (8,371)
Basic and diluted earnings per share: |  |
Loss from continuing operations before discontinued operations | $ 0.00 | $ (0.30)
Income (loss) from discontinued operations, net of tax | $ 0.01 | $ (0.01)
Loss on disposal of discontinued operations, net of tax | $ (0.01) | $ 0.00
Net loss per common share | $ 0.00 | $ (0.31)
Basic and diluted weighted average common shares outstanding | 39,662 | 26,992

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