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Consolidated Statements Of Cash Flows (USD $)
In Thousands
9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Cash flows from operating activities:  
Net income$ 73,389$ 55,924
Adjustments to reconcile net income to net cash provided by operating activities:  
Depreciation119,161112,848
Deferred income taxes35,169(4,410)
Gain on disposal of property and equipment(16,454)(3,086)
Stock-based compensation1,877964
Insurance claims accruals, net of current portion7,0004,250
Other(844)1,539
Changes in certain working capital items:  
Accounts receivable, net(23,241)(20,745)
Other current assets(1)(4,797)
Accounts payable6,7298,558
Other current liabilities(2,446)4,202
Net cash provided by operating activities200,339155,247
Cash flows from investing activities:  
Additions to property and equipment(208,469)(119,660)
Retirements of property and equipment54,86936,563
Decrease in notes receivable4,2183,299
Net cash used in investing activities(149,382)(79,798)
Cash flows from financing activities:  
Repayments of short-term debt(20,000)(10,000)
Proceeds from issuance of short-term debt20,00010,000
Dividends on common stock(10,911)(10,816)
Stock options exercised2,6267,685
Excess tax benefits from exercise of stock options5993,399
Net cash provided by (used in) financing activities(7,686)268
Effect of foreign exchange rate fluctuations on cash(352)701
Net increase in cash and cash equivalents42,91976,418
Cash and cash equivalents, beginning of period13,96618,430
Cash and cash equivalents, end of period56,88594,848
Supplemental disclosures of cash flow information:  
Interest paid4317
Income taxes paid23,86451,022
Supplemental schedule of non-cash investing activities:  
Notes receivable issued upon sale of property and equipment$ 6,053$ 3,507