UNAUDITED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 258,021	$ 310,073
Marketable securities	0	12,435
Accounts receivable, net of allowances aggregating $22,791 and $18,106, respectively	575,575	579,394
Unbilled accounts receivable	50,050	26,568
Deferred costs	18,676	16,134
Inventories and supplies	170,934	152,096
Prepaid expenses and other current assets	48,540	41,962
Deferred tax assets	32,141	32,517
Total current assets	1,153,937	1,171,179
Property, plant and equipment, net	1,579,701	1,602,170
Other assets:
Deferred financing costs	18,403	20,860
Goodwill	449,577	570,960
Permits and other intangibles, net	541,874	569,973
Other	17,725	18,536
Total other assets	1,027,579	1,180,329
Total assets	3,761,217	3,953,678
Current liabilities:
Current portion of capital lease obligations	264	1,329
Accounts payable	251,832	316,462
Deferred revenue	63,909	55,454
Accrued expenses	260,123	236,829
Current portion of closure, post-closure and remedial liabilities	32,742	29,471
Total current liabilities	608,870	639,545
Other liabilities:
Closure and post-closure liabilities, less current portion of $3,839 and $5,884, respectively	46,287	41,201
Remedial liabilities, less current portion of $28,903 and $23,587, respectively	133,972	148,911
Long-term obligations	1,395,000	1,400,000
Capital lease obligations, less current portion	733	1,435
Deferred taxes, unrecognized tax benefits and other long-term liabilities	255,804	246,947
Total other liabilities	1,831,796	1,838,494
Common stock, $.01 par value:
Authorized 80,000,000; shares issued and outstanding 59,947,866 and 60,672,180 shares, respectively	600	607
Shares held under employee participation plan	(469)	(469)
Additional paid-in capital	853,350	898,165
Accumulated other comprehensive loss	(74,117)	(19,556)
Accumulated earnings	541,187	596,892
Total stockholders’ equity	1,320,551	1,475,639
Total liabilities and stockholders’ equity	$ 3,761,217	$ 3,953,678