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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash flows from operating activities:      
Net income $ 201,858 $ 160,377 $ 116,919
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation, amortization, and accretion 28,977 12,283 10,194
(Recovery of) provision for doubtful accounts, net (704) (786) 399
Write-down of inventory 7,009 2,465 3,955
Deferred tax provision (67) (1,712) 5,308
Stock compensation 14,803 12,782 13,016
Other 2,735 (391) 1,060
Changes in operating assets and liabilities, net of assets and liabilities acquired in the acquisition of businesses:      
Trade accounts receivable (63,199) (39,449) 31,527
Inventories (127,739) (41,107) 5,247
Prepaid expenses and other current assets (75,525) (6,766) (3,408)
Other assets (5,385) (1,651) (1,012)
Trade accounts payable 38,237 19,742 3,790
Accrued expenses 850 16,468 2,583
Income taxes payable 5,722 5,480 (6,525)
Long-term liabilities 2,519 2,187 2,421
Net cash provided by operating activities 30,091 139,922 185,474
Cash flows from investing activities:      
Purchases of short-term investments     (66,900)
Proceeds from sales of short-term investments   26,080 57,078
Purchases of property and equipment (55,538) (22,489) (13,699)
Acquisitions of businesses and equity method investment (125,203) (5,191) (1,877)
Purchases of intangible assets (4,025)    
Net cash used in investing activities (184,766) (1,600) (25,398)
Cash flows from financing activities:      
Proceeds from issuance of short-term borrowings 45,000    
Repayments of short-term borrowings (45,000)    
Cash paid for shares withheld for taxes (22,634) (2,584) (1,982)
Excess tax benefits from stock compensation 15,330 3,525 810
Cash received from issuances of common stock 62 89 107
Cash paid for repurchases of common stock (19,918) (10,082) (20,000)
Net cash used in financing activities (27,160) (9,052) (21,065)
Effect of exchange rates on cash 215 94 47
Net change in cash and cash equivalents (181,620) 129,364 139,058
Cash and cash equivalents at beginning of year 445,226 315,862 176,804
Cash and cash equivalents at end of year 263,606 445,226 315,862
Cash paid during the year for:      
Income taxes 62,405 82,493 66,540
Interest 88 59 19
Non-cash investing activity:      
Accruals for purchases of property and equipment 3,268 247 1,356
Contingent consideration arrangement for acquisition of business 88,100    
Accruals for asset retirement obligation assets 236 388  
Non-cash financing activity:      
Accruals for shares withheld for taxes $ 2,460 $ 1,598 $ 603