UNAUDITED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 173,621	$ 246,879
Accounts receivable, net of allowances aggregating $32,207 and $25,661, respectively	684,875	557,131
Unbilled accounts receivable	37,095	40,775
Deferred costs	19,575	19,018
Inventories and supplies	149,861	168,663
Prepaid expenses and other current assets	60,880	57,435
Deferred tax assets	37,410	36,532
Total current assets	1,163,317	1,126,433
Property, plant and equipment, net	1,562,254	1,558,834
Other assets:
Deferred financing costs	15,941	17,580
Goodwill	452,858	452,669
Permits and other intangibles, net	534,621	530,080
Other	17,646	18,682
Total other assets	1,021,066	1,019,011
Total assets	3,746,637	3,704,278
Current liabilities:
Current portion of capital lease obligations	45	536
Accounts payable	365,088	267,329
Deferred revenue	64,642	62,966
Accrued expenses	241,098	219,549
Current portion of closure, post-closure and remedial liabilities	26,321	22,091
Total current liabilities	697,194	572,471
Other liabilities:
Closure and post-closure liabilities, less current portion of $7,693 and $4,999, respectively	44,153	45,702
Remedial liabilities, less current portion of $18,628 and $17,092, respectively	130,149	138,029
Long-term obligations	1,395,000	1,395,000
Deferred taxes, unrecognized tax benefits and other long-term liabilities	306,705	290,205
Total other liabilities	$ 1,876,007	$ 1,868,936
Commitments and contingent liabilities (See Note 15)
Stockholders’ equity:
Common stock, $.01 par value: authorized 80,000,000; shares issued and outstanding XXXXXXX and 58,903,482 shares, respectively	$ 584	$ 589
Shares held under employee participation plan	(469)	(469)
Additional paid-in capital	777,465	805,029
Accumulated other comprehensive loss	(176,014)	(110,842)
Accumulated earnings	571,870	568,564
Total stockholders’ equity	1,173,436	1,262,871
Total liabilities and stockholders’ equity	$ 3,746,637	$ 3,704,278