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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Current assets: |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | $ 68,363 | $ 114,422
Marketable securities | 0 | 93,001
Total cash, cash equivalents, and marketable securities | 68,363 | 207,423
Accounts receivable | 199,720 | 180,872
Unbilled receivables | 180,219 | 172,656
Other current assets | 57,308 | 49,684
Total current assets | 505,610 | 610,635
Long-term unbilled receivables | 121,736 | 151,237
Goodwill | 79,039 | 72,858
Other long-term assets | 278,427 | 147,823
Total assets | 984,812 | 982,553
Current liabilities: |  |
Accounts payable | 17,475 | 16,487
Accrued expenses | 48,001 | 43,143
Accrued compensation and related expenses | 104,126 | 84,671
Deferred revenue | 190,080 | 185,145
Other current liabilities | 18,273 | 2,363
Total current liabilities | 377,955 | 331,809
Operating lease liabilities | 52,610 | 0
Other long-term liabilities | 15,237 | 29,213
Total liabilities | 445,802 | 361,022
Commitments and Contingencies |  |
Stockholders’ equity: |  |
Preferred stock, $0.01 par value, 1,000 shares authorized; none issued | 0 | 0
Common stock, $0.01 par value, 200,000 shares authorized; 79,599 and 78,526 shares issued and outstanding at December 31, 2019 and 2018, respectively | 796 | 785
Additional paid-in capital | 140,523 | 123,205
Retained earnings | 410,919 | 510,863
Accumulated other comprehensive (loss) |  |
Net unrealized gain on available-for-sale marketable securities, net of tax | 0 | (249)
Foreign currency translation adjustments | (13,228) | (13,073)
Total stockholders’ equity | 539,010 | 621,531
Total liabilities and stockholders’ equity | $ 984,812 | $ 982,553

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