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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 204,455 | $ 226,507
Short-term marketable securities | 55,198 | 52,856
Accounts receivable, net of allowances aggregating $36,398 and $44,315, respectively | 632,888 | 606,952
Unbilled accounts receivable | 52,174 | 54,794
Deferred costs | 22,500 | 18,770
Inventories and supplies | 203,331 | 199,479
Prepaid expenses and other current assets | 42,640 | 42,800
Total current assets | 1,213,186 | 1,202,158
Property, plant and equipment, net | 1,596,917 | 1,561,978
Other assets: |  |
Operating lease right-of-use asset | 173,504 |
Goodwill | 525,044 | 514,189
Permits and other intangibles, net | 433,853 | 441,875
Other | 12,817 | 18,121
Total other assets | 1,145,218 | 974,185
Total assets | 3,955,321 | 3,738,321
Current liabilities: |  |
Current portion of long-term obligations | 7,535 | 7,535
Accounts payable | 253,177 | 276,461
Deferred revenue | 75,170 | 61,843
Accrued expenses | 224,497 | 233,405
Current portion of closure, post-closure and remedial liabilities | 30,747 | 23,034
Current portion of operating lease liabilities | 42,564 |
Total current liabilities | 633,690 | 602,278
Other liabilities: |  |
Closure and post-closure liabilities, less current portion of $13,491 and $9,592, respectively | 62,339 | 60,339
Remedial liabilities, less current portion of $17,256 and $13,442, respectively | 101,019 | 107,575
Long-term obligations, less current portion | 1,562,989 | 1,565,021
Operating lease liabilities, less current portion | 130,704 |
Deferred taxes, unrecognized tax benefits and other long-term liabilities | 255,113 | 233,352
Total other liabilities | 2,112,164 | 1,966,287
Commitments and contingent liabilities (See Note 16) |  |
Stockholders’ equity: |  |
Authorized 80,000,000; shares issued and outstanding 55,859,402 and 55,847,261 shares, respectively | 559 | 558
Additional paid-in capital | 648,805 | 655,415
Accumulated other comprehensive loss | (214,271) | (223,371)
Accumulated earnings | 774,374 | 737,154
Total stockholders’ equity | 1,209,467 | 1,169,756
Total liabilities and stockholders’ equity | $ 3,955,321 | $ 3,738,321

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