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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Operating Activities    
Net income $ 34,551 $ 7,012
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 34,965 28,779
Share-based compensation expense 24,811 22,010
Deferred income taxes 453 (9,409)
Amortization of operating lease right-of-use assets 5,791 5,157
Amortization of debt issuance costs 1,707 482
Amortization of discount on convertible senior notes 9,195 0
Changes in operating assets and liabilities:    
Accounts receivable and unbilled receivables (19,662) 28,236
Inventories (6,569) (7,271)
Prepaid expenses (1,415) 1,181
Other current assets 188 219
Investment in sales-type leases 2,423 (1,375)
Prepaid commissions 1,852 4,040
Other long-term assets 1,559 (4,580)
Accounts payable 15,684 (11,254)
Accrued compensation (7,263) (3,098)
Accrued liabilities 10,142 (2,824)
Deferred revenues 27,454 16,264
Operating lease liabilities (6,247) (5,186)
Other long-term liabilities (431) 4,352
Net cash provided by operating activities 129,188 72,735
Investing Activities    
Software development for external use (15,415) (20,002)
Purchases of property and equipment (11,067) (13,211)
Net cash used in investing activities (26,482) (33,213)
Financing Activities    
Repayment of revolving credit facility 0 (50,000)
Proceeds from issuances under stock-based compensation plans 32,343 21,162
Employees’ taxes paid related to restricted stock units (6,667) (3,470)
Change in customer funds, net (3,263) 0
Net cash provided by (used in) financing activities 22,413 (32,308)
Effect of exchange rate changes on cash and cash equivalents (74) (841)
Net increase in cash, cash equivalents, and restricted cash 125,045 6,373
Cash, cash equivalents, and restricted cash at beginning of period 489,920 127,210
Cash, cash equivalents, and restricted cash at end of period 614,965 133,583
Reconciliation of cash, cash equivalents, and restricted cash to the Condensed Consolidated Balance Sheets:    
Cash and cash equivalents 614,236 133,583
Restricted cash included in Other current assets 729 0
Cash, cash equivalents, and restricted cash at end of period 614,965 133,583
Supplemental disclosure of non-cash activities    
Unpaid purchases of property and equipment 607 366
Transfers between inventory and property and equipment, net $ 1,876 $ 0