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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Current assets: |  |  |
Cash and cash equivalents | [1],[2] | $ 114,422 | $ 162,279
Marketable securities | [1] | 93,001 | 61,469
Total cash, cash equivalents, and marketable securities | [1] | 207,423 | 223,748
Accounts receivable | [1] | 180,872 | 222,735
Unbilled receivables | [1] | 172,656 | 160,084
Other current assets | [1] | 49,684 | 41,135
Total current assets | [1] | 610,635 | 647,702
Long-term unbilled receivables | [1] | 151,237 | 160,708
Goodwill | [1] | 72,858 | 72,952
Other long-term assets | [1] | 147,823 | 131,391
Total assets | [1] | 982,553 | 1,012,753
Current liabilities: |  |  |
Accounts payable | [1] | 16,487 | 17,370
Accrued expenses | [1] | 45,506 | 45,508
Accrued compensation and related expenses | [1] | 84,671 | 66,040
Deferred revenue | [1] | 185,145 | 165,850
Total current liabilities | [1] | 331,809 | 294,768
Deferred income tax liabilities | [1] | 6,939 | 38,463
Other long-term liabilities | [1] | 22,274 | 23,652
Total liabilities | [1] | 361,022 | 356,883
Commitments and Contingencies (Note 19) | [1] |  |
Stockholders’ equity: |  |  |
Preferred stock, $0.01 par value, 1,000 shares authorized; none issued | [1] | 0 | 0
Common stock, $0.01 par value, 200,000 shares authorized; 78,526 and 78,081 shares issued and outstanding at December 31, 2018 and 2017, respectively | [1] | 785 | 781
Additional paid-in capital | [1] | 123,205 | 152,097
Retained earnings | [1] | 510,863 | 509,697
Accumulated other comprehensive loss: |  |  |
Net unrealized loss on available-for-sale marketable securities, net of tax | [1] | (249) | (232)
Foreign currency translation adjustments | [1] | (13,073) | (6,473)
Total stockholders’ equity | [1],[3] | 621,531 | 655,870
Total liabilities and stockholders’ equity | [1] | $ 982,553 | $ 1,012,753
[1] | On January 1, 2018, the Company adopted the ASC 606 revenue recognition standard and adjusted prior periods to conform. See "Note 2. Significant Accounting Policies" for additional information.
[2] | On January 1, 2018, the Company adopted the ASC 606 revenue recognition standard and adjusted prior periods to conform. See "Note 2. Significant Accounting Policies" for additional information.
[3] | On January 1, 2018, the Company adopted the ASC 606 revenue recognition standard and adjusted prior periods to conform. See "Note 2. Significant Accounting Policies" for additional information.

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