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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
May 31, 2021
May 31, 2020
Cash flows from operating activities:    
Net income $ 32,518 $ 38,084
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization of property and equipment 2,741 3,248
Amortization of acquired intangibles and other 22,267 11,993
Amortization of debt discount and issuance costs on Notes 1,683 0
Stock-based compensation 15,146 11,674
Non-cash lease expense 4,183 4,907
Loss on disposal of property and equipment 3 531
Deferred income taxes (705) 1,944
Allowances for bad debt and sales credits (358) 274
Changes in operating assets and liabilities:    
Accounts receivable 29,105 18,369
Other assets 1,722 4,968
Accounts payable and accrued liabilities (11,554) (18,664)
Lease liabilities (4,467) (4,076)
Income taxes payable (1,059) 940
Deferred revenue 8,153 (3,219)
Net cash flows from operating activities 99,378 70,973
Cash flows from (used in) investing activities:    
Purchases of investments 0 (5,009)
Sales and maturities of investments 2,650 14,051
Purchases of property and equipment (2,116) (1,757)
Decrease in escrow receivable 2,130 0
Net cash flows from investing activities 2,664 7,285
Cash flows from (used in) financing activities:    
Proceeds from stock-based compensation plans 6,300 7,308
Payments for taxes related to net share settlements of equity awards (2,373) (3,895)
Repurchases of common stock (35,000) (20,000)
Proceeds from issuance of senior convertible notes, net of issuance costs of $9,900 350,100 0
Purchase of capped calls (43,056) 0
Dividend payments to shareholders (15,617) (14,906)
Payment of principal on long-term debt (106,025) (3,762)
Payment of debt issuance costs (904) 0
Net cash flows from (used in) financing activities 153,425 (35,255)
Effect of exchange rate changes on cash 3,903 (4,040)
Net increase in cash and cash equivalents 259,370 38,963
Cash and cash equivalents, beginning of period 97,990 154,259
Cash and cash equivalents, end of period 357,360 193,222
Supplemental disclosure:    
Cash paid for income taxes, net of refunds of $488 in 2021 and $239 in 2020 6,677 4,587
Cash paid for interest 4,480 4,898
Non-cash investing and financing activities:    
Total fair value of restricted stock awards, restricted stock units and deferred stock units on date vested 8,698 12,090
Dividends declared $ 7,921 $ 7,539