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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 186,352 | $ 319,399
Short-term marketable securities | 37,792 | 38,179
Accounts receivable, net of allowances aggregating $29,145 and $27,799, respectively | 551,841 | 528,924
Unbilled accounts receivable | 63,375 | 35,922
Deferred costs | 20,847 | 20,445
Inventories and supplies | 181,438 | 176,012
Prepaid expenses and other current assets | 38,177 | 35,175
Total current assets | 1,079,822 | 1,154,056
Property, plant and equipment, net | 1,631,648 | 1,587,365
Other assets: |  |
Goodwill | 492,705 | 478,523
Permits and other intangibles, net | 464,635 | 469,128
Other | 16,006 | 17,498
Total other assets | 973,346 | 965,149
Total assets | 3,684,816 | 3,706,570
Current liabilities: |  |
Current portion of long-term obligations | 4,000 | 4,000
Accounts payable | 237,953 | 224,231
Deferred revenue | 68,748 | 67,822
Accrued expenses | 194,160 | 187,982
Current portion of closure, post-closure and remedial liabilities | 19,823 | 19,782
Total current liabilities | 524,684 | 503,817
Other liabilities: |  |
Closure and post-closure liabilities, less current portion of $5,519 and $6,444, respectively | 58,561 | 54,593
Remedial liabilities, less current portion of $14,304 and $13,338, respectively | 108,143 | 111,130
Long-term obligations, less current portion | 1,625,259 | 1,625,537
Deferred taxes, unrecognized tax benefits and other long-term liabilities | 222,643 | 223,291
Total other liabilities | 2,014,606 | 2,014,551
Commitments and contingent liabilities (See Note 16) |  |
Stockholders’ equity: |  |
Authorized 80,000,000; shares issued and outstanding 56,244,601 and 56,501,190 shares, respectively | 562 | 565
Additional paid-in capital | 675,230 | 686,962
Accumulated other comprehensive loss | (189,153) | (172,407)
Accumulated earnings | 658,887 | 673,082
Total stockholders’ equity | 1,145,526 | 1,188,202
Total liabilities and stockholders’ equity | $ 3,684,816 | $ 3,706,570

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