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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Operating Activities    
Net income $ 14,127 $ 11,311
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 17,575 14,043
Share-based compensation expense 11,772 10,659
Deferred income taxes (862) (1,149)
Amortization of operating lease right-of-use assets 2,895 2,682
Amortization of debt issuance costs 849 241
Amortization of discount on convertible senior notes 4,571 0
Changes in operating assets and liabilities:    
Accounts receivable and unbilled receivables (15,427) (16,052)
Inventories (1,035) (5,734)
Prepaid expenses (1,095) 323
Other current assets 3,128 968
Investment in sales-type leases 925 (268)
Prepaid commissions 2,710 2,881
Other long-term assets 2,177 (2,844)
Accounts payable 10,368 208
Accrued compensation (17,899) (9,165)
Accrued liabilities 4,661 2,734
Deferred revenues 21,749 16,868
Operating lease liabilities (3,142) (2,784)
Other long-term liabilities (632) 309
Net cash provided by operating activities 57,415 25,231
Investing Activities    
Software development for external use (8,043) (10,602)
Purchases of property and equipment (5,089) (3,173)
Net cash used in investing activities (13,132) (13,775)
Financing Activities    
Repayment of revolving credit facility 0 (50,000)
Proceeds from issuances under stock-based compensation plans 20,826 17,659
Employees’ taxes paid related to restricted stock units (2,596) (1,425)
Change in customer funds, net (2,631) 0
Net cash provided by (used in) financing activities 15,599 (33,766)
Effect of exchange rate changes on cash and cash equivalents (386) (820)
Net increase (decrease) in cash, cash equivalents, and restricted cash 59,496 (23,130)
Cash, cash equivalents, and restricted cash at beginning of period 489,920 127,210
Cash, cash equivalents, and restricted cash at end of period 549,416 104,080
Reconciliation of cash, cash equivalents, and restricted cash to the Condensed Consolidated Balance Sheets:    
Cash, cash equivalents, and restricted cash at end of period 549,416 104,080
Supplemental disclosure of non-cash activities    
Unpaid purchases of property and equipment 487 944
Transfers between inventory and property and equipment, net $ 1,269 $ 0