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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Apr. 30, 2012
Apr. 30, 2011
Apr. 30, 2010
Cash Flows from Operating Activities:      
Net (loss) income $ (77,592) $ 38,428 $ (13,858)
Adjustments to reconcile net loss to net cash provided by operating activities -      
Loss (income) from discontinued operations, net   1,458 (1,011)
Gain on disposal of discontinued operations, net (725) (43,590) (1,180)
Gain on sale of assets   (3,502)  
Gain on sale of property and equipment (1,004) (470) (1,343)
Depreciation and amortization 58,576 58,261 63,619
Depletion of landfill operating lease obligations 8,482 7,878 6,867
Interest accretion on landfill and environmental remediation liabilities 3,479 3,331 3,506
Environmental remediation charge   549 335
Asset impairment charge 40,746 3,654  
Bargain purchase gain   (2,975)  
Development project charge 131    
Amortization of premium on senior subordinated notes   (611) (727)
Amortization of discount on term loan and second lien notes 964 801 685
Loss from equity method investments 9,994 4,096 2,691
Impairment of equity method investment 10,680    
Loss on debt extinguishment 300 7,390 511
Stock-based compensation 1,855 1,592 1,987
Excess tax benefit on the vesting of share based awards (254) (129)  
Deferred income taxes 1,899 (23,615) 3,031
Changes in assets and liabilities, net of effects of acquisitions and divestitures -      
Accounts receivable 7,442 (3,273) (8,179)
Accounts payable 4,210 7,443 5,092
Prepaid expenses, inventories and other assets 318 3,834 2,755
Accrued expenses and other liabilities (5,726) (13,459) (695)
Net Cash Provided By Operating Activities 63,775 47,091 64,086
Cash Flows from Investing Activities:      
Acquisitions, net of cash acquired (2,102) (1,744) (864)
Additions to property, plant and equipment attributable to acquisitions (529) (5)  
Additions to property, plant and equipment - growth (12,211) (2,803) (4,187)
Additions to property, plant and equipment - maintenance (47,001) (52,441) (48,647)
Payments on landfill operating lease contracts (6,616) (5,655) (13,737)
Purchase of gas rights   (1,608)  
Proceeds from sale of assets   7,533  
Proceeds from sale of property and equipment 1,492 959 4,434
Investments in unconsolidated entities (5,045)   (49)
Net Cash Used In Investing Activities (72,012) (55,764) (63,050)
Cash Flows from Financing Activities:      
Proceeds from long-term borrowings 163,500 383,757 492,344
Principal payments on long-term debt (152,806) (491,669) (485,796)
Payments of financing costs (1,592) (10,588) (14,089)
Proceeds from exercise of share based awards 337 476 260
Excess tax benefit on the vesting of share based awards 254 129  
Contributions from noncontrolling interest holder 536    
Net Cash Provided By (Used In) Financing Activities 10,229 (117,895) (7,281)
Discontinued Operations:      
Net cash (used in) provided by operating activities   (359) 5,651
Net cash provided by investing activities 725 130,114 1,317
Net cash used in financing activities   (3,405) (526)
Net Cash Provided By Discontinued Operations 725 126,350 6,442
Net increase (decrease) in cash and cash equivalents 2,717 (218) 197
Cash and cash equivalents, beginning of period 1,817 2,035 1,838
Cash and cash equivalents, end of period 4,534 1,817 2,035
Cash paid during the period for -      
Interest 41,243 44,291 35,583
Income taxes, net of refunds 5,048 1,480 234
Summary of entities acquired in purchase business combinations -      
Fair value of net assets acquired 2,217 6,456 1,512
Bargain purchase gain   2,975  
Cash paid, net 2,102 1,744 864
Notes payable, liabilities assumed and holdbacks to sellers 115 1,737 648
Property, plant and equipment acquired through lease obligations     404
Equipment contributed by noncontrolling interest $ 1,270