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Condensed Unaudited Consolidated Statements Of Cash Flows (USD $)
In Thousands
9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Cash flows from operating activities:  
Net income$ 97,411$ 51,956
Adjustments to reconcile net income to net cash provided by operating activities:  
Depreciation and amortization53,55243,183
Stock-based compensation expense2,7792,971
Excess tax benefit from stock-based compensation(3,942) 
Non-cash interest expense5,4602,423
Provision for doubtful accounts1,4782,014
Provision for losses on projects, net695(54)
Provision for inventory obsolescence1,634225
Impairment of securities available for sale457821
Loss (gain) on disposal of assets139(949)
Gain on remeasurement of equity interest in acquiree(29,041) 
(Earnings) losses from equity method investments(27)234
Changes in assets and liabilities, net of assets acquired and liabilities assumed:  
Accounts receivable(226,993)(116,802)
Inventories(36,974)(30,977)
Deferred tax assets and liabilities, net38,81629,518
Other assets, current and non-current portion966(1,460)
Accounts payable and accrued expenses116,16570,668
Billings in excess of costs and earnings(61,916)47,961
Other liabilities, current and non-current portion(1,056)(1,065)
Net cash (used in) provided by operating activities(40,397)100,667
Cash flows used in investing activities:  
Cash paid for acquisitions, net, including contingent consideration(85,367)(29,350)
Capital expenditures(56,996)(22,813)
Proceeds from sale of assets4,4564,622
Proceeds from sales or redemption of investments4,600 
Investments in life insurance policies(283)(194)
Net cash used in investing activities(133,590)(47,735)
Cash flows provided by (used in) financing activities:  
Proceeds from credit facility135,761 
Repayments of credit facility(108,761) 
Payments of other borrowings(9,098)(10,814)
Payments of capital lease obligations(12,926)(12,024)
Proceeds from stock option exercises11,9211,208
Excess tax benefit from stock-based compensation3,942 
Purchases of treasury stock(1,950) 
Payments of financing costs(6,069)(118)
Net cash provided by (used in) financing activities12,820(21,748)
Net (decrease) increase in cash and cash equivalents(161,167)31,184
Net effect of currency translation on cash(74)67
Cash and cash equivalents - beginning of period177,60488,521
Cash and cash equivalents - end of period16,363119,772
Supplemental cash flow information:  
Interest paid20,55821,388
Income taxes paid18,5703,459
Supplemental disclosure of noncash information:  
Equipment acquired under capital lease5,2862,243
Equipment acquired under financing arrangements10,692 
Conversion of leases from operating to capital23,366 
Shares issued for business combinations94,213 
Exchange of senior convertible notes$ 202,322