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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net loss $ (12,631) $ (21,393)
Adjustments to reconcile net loss to net cash from operating activities:    
Depreciation and amortization 74,844 72,412
Allowance for doubtful accounts 2,303 1,935
Amortization of deferred financing costs and debt discount 916 829
Accretion of environmental liabilities 2,430 2,290
Changes in environmental liability estimates (562) 102
Deferred income taxes (5) 196
Stock-based compensation 3,077 2,271
Other expense, net 299 1,549
Environmental expenditures (2,425) (2,938)
Changes in assets and liabilities, net of acquisitions    
Accounts receivable and unbilled accounts receivable (14,769) 24,301
Inventories and supplies (5,625) (2,676)
Other current assets (2,923) (1,277)
Accounts payable 9,714 (13,609)
Other current and long-term liabilities (2,740) (6,873)
Net cash from operating activities 51,903 57,119
Cash flows used in investing activities:    
Additions to property, plant and equipment (44,242) (42,462)
Proceeds from sale and disposal of fixed assets 798 1,030
Acquisitions, net of cash acquired (120,000) (11,946)
Proceeds from sale of business 0 2,018
Additions to intangible assets, including costs to obtain or renew permits (1,245) (751)
Proceeds from sale of available-for-sale securities 3,264 243
Purchases of available-for-sale securities (3,003) 0
Net cash used in investing activities (164,428) (51,868)
Cash flows used in financing activities:    
Change in uncashed checks (3,843) (7,557)
Proceeds from exercise of stock options 0 46
Tax payments related to withholdings on vested restricted stock (548) (1,021)
Repurchases of common stock (14,264) (6,796)
Deferred financing costs paid 0 (108)
Principal payment on debt (1,000) 0
Net cash used in financing activities (19,655) (15,436)
Effect of exchange rate change on cash (867) 554
Decrease in cash and cash equivalents (133,047) (9,631)
Cash and cash equivalents, beginning of period 319,399 306,997
Cash and cash equivalents, end of period 186,352 297,366
Cash payments for interest and income taxes:    
Interest paid 14,676 21,717
Income taxes paid 1,999 5,519
Non-cash investing activities:    
Property, plant and equipment accrued 17,911 19,270
Receivable for estimated purchase price adjustment $ 0 $ 1,972