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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash Flows from Operating Activities:    
Net income $ 204,289 $ 111,856
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 25,057 23,204
Provision for credit losses 186 4,229
Deferred income taxes 5,244 2,853
Share-based compensation expense 8,875 7,284
Other 333 (13)
Changes in assets and liabilities:    
Accounts receivable (54,735) (38,062)
Inventories (7,919) (14,434)
Other assets and liabilities (57,081) (64,881)
Accounts payable 2,460 (1,755)
Deferred revenue (2,287) (2,410)
Net cash provided by operating activities 124,422 27,871
Cash Flows from Investing Activities:    
Purchases of property and equipment (20,163) (49,002)
Acquisition of intangible assets and equity investment 0 (668)
Acquisitions of a business, net of cash acquired (4,424) 0
Net cash used by investing activities (24,587) (49,670)
Cash Flows from Financing Activities:    
Borrowings on revolving credit facilities, net 0 198,110
Repurchases of common stock, net (132,262) (182,815)
Proceeds from exercises of stock options and employee stock purchase plans 17,594 10,210
Shares withheld for statutory tax withholding on restricted stock (14,983) (8,604)
Net cash (used) provided by financing activities (129,651) 16,901
Net effect of changes in exchange rates on cash (2,949) (4,033)
Net decrease in cash and cash equivalents (32,765) (8,931)
Cash and cash equivalents at beginning of period 383,928 90,326
Cash and cash equivalents at end of period 351,163 81,395
Supplemental Cash Flow Information:    
Cash paid for income taxes 12,171 12,020
Unpaid property and equipment, reflected in accounts payable and accrued liabilities $ 6,592 $ 14,123