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UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Current assets:    
Cash and cash equivalents $ 172,708 $ 171,899
Marketable securities 269,650 293,269
Total cash, cash equivalents, and marketable securities 442,358 465,168
Accounts receivable 159,324 215,827
Unbilled receivables 228,603 207,155
Other current assets 91,868 88,760
Total current assets 922,153 976,910
Unbilled receivables 108,048 113,278
Goodwill 82,037 79,231
Other long-term assets 416,265 434,843
Total assets 1,528,503 1,604,262
Current liabilities:    
Accounts payable 24,426 24,028
Accrued expenses 59,765 59,261
Accrued compensation and related expenses 59,490 123,012
Deferred revenue 244,170 232,865
Other current liabilities 16,599 20,969
Total current liabilities 404,450 460,135
Convertible senior notes, net 588,418 518,203
Operating lease liabilities 36,471 59,053
Other long-term liabilities 20,239 24,699
Total liabilities 1,049,578 1,062,090
Stockholders’ equity:    
Preferred stock, 1,000 shares authorized; none issued 0 0
Common stock, 200,000 shares authorized; 81,246 and 80,890 shares issued and outstanding at March 31, 2021 and December 31, 2020, respectively 812 809
Additional paid-in capital 140,558 204,432
Retained earnings 340,223 339,879
Accumulated other comprehensive (loss) (2,668) (2,948)
Total stockholders’ equity 478,925 542,172
Total liabilities and stockholders’ equity $ 1,528,503 $ 1,604,262