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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 226,507 | $ 319,399
Short-term marketable securities | 52,856 | 38,179
Accounts receivable, net of allowances aggregating $44,315 and $27,799, respectively | 606,952 | 528,924
Unbilled accounts receivable | 54,794 | 35,922
Deferred costs | 18,770 | 20,445
Inventories and supplies | 199,479 | 176,012
Prepaid expenses and other current assets | 42,800 | 35,175
Total current assets | 1,202,158 | 1,154,056
Property, plant and equipment, net | 1,561,978 | 1,587,365
Other assets: |  |
Goodwill | 514,189 | 478,523
Permits and other intangibles, net | 441,875 | 469,128
Other | 18,121 | 17,498
Total other assets | 974,185 | 965,149
Total assets | 3,738,321 | 3,706,570
Current liabilities: |  |
Current portion of long-term obligations | 7,535 | 4,000
Accounts payable | 276,461 | 224,231
Deferred revenue | 61,843 | 67,822
Accrued expenses | 233,405 | 187,982
Current portion of closure, post-closure and remedial liabilities | 23,034 | 19,782
Total current liabilities | 602,278 | 503,817
Other liabilities: |  |
Closure and post-closure liabilities, less current portion of $9,592 and $6,444, respectively | 60,339 | 54,593
Remedial liabilities, less current portion of $13,442 and $13,338, respectively | 107,575 | 111,130
Long-term obligations, less current portion | 1,565,021 | 1,625,537
Deferred taxes, unrecognized tax benefits and other long-term liabilities | 233,352 | 223,291
Total other liabilities | 1,966,287 | 2,014,551
Commitments and contingent liabilities (See Note 18) |  |
Stockholders' equity: |  |
Common stock, $.01 par value: Authorized 80,000,000 shares; issued and outstanding 56,501,190 and 57,297,978 shares, respectively | 558 | 565
Additional paid-in capital | 655,415 | 686,962
Accumulated other comprehensive loss | (223,371) | (172,407)
Accumulated earnings | 737,154 | 673,082
Total stockholders' equity | 1,169,756 | 1,188,202
Total liabilities and stockholders' equity | $ 3,738,321 | $ 3,706,570

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