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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 319,399 | $ 306,997
Short-term marketable securities | 38,179 | 0
Accounts receivable, net of allowances aggregating $27,799 and $29,249, respectively | 528,924 | 496,226
Unbilled accounts receivable | 35,922 | 36,190
Deferred costs | 20,445 | 18,914
Inventories and supplies | 176,012 | 178,428
Prepaid expenses and other current assets | 35,175 | 56,116
Total current assets | 1,154,056 | 1,092,871
Property, plant and equipment, net | 1,587,365 | 1,611,827
Other assets: |  |
Goodwill | 478,523 | 465,154
Permits and other intangibles, net | 469,128 | 498,721
Other | 17,498 | 13,347
Total other assets | 965,149 | 977,222
Total assets | 3,706,570 | 3,681,920
Current liabilities: |  |
Current portion of long-term obligations | 4,000 | 0
Accounts payable | 224,231 | 229,534
Deferred revenue | 67,822 | 64,397
Accrued expenses | 187,982 | 190,721
Current portion of closure, post-closure and remedial liabilities | 19,782 | 20,016
Total current liabilities | 503,817 | 504,668
Other liabilities: |  |
Closure and post-closure liabilities, less current portion of $6,444 and $6,220, respectively | 54,593 | 52,111
Remedial liabilities, less current portion of $13,338 and $13,796, respectively | 111,130 | 114,211
Long-term obligations, less current portion | 1,625,537 | 1,633,272
Deferred taxes, unrecognized tax benefits and other long-term liabilities | 223,291 | 293,417
Total other liabilities | 2,014,551 | 2,093,011
Commitments and contingent liabilities (See Note 17) |  |
Stockholders' equity: |  |
Common stock, $.01 par value: Authorized 80,000,000 shares; issued and outstanding 56,501,190 and 57,297,978 shares, respectively | 565 | 573
Shares held under employee participation plan | 0 | (469)
Additional paid-in capital | 686,962 | 725,670
Accumulated other comprehensive loss | (172,407) | (214,326)
Accumulated earnings | 673,082 | 572,793
Total stockholders' equity | 1,188,202 | 1,084,241
Total liabilities and stockholders' equity | $ 3,706,570 | $ 3,681,920

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- Definition The amount of estimated costs accrued as of the balance sheet date to comply with regulatory requirements pertaining to the retirement of a waste management facility (such as a landfill or waste treatment facility) and to remediate one or more sites. Represents the portion that will be paid within one year. + References No definition available. + Details
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