UNAUDITED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 278,644	$ 310,073
Marketable securities	0	12,435
Accounts receivable, net of allowances aggregating $21,446 and $18,106, respectively	575,187	579,394
Unbilled accounts receivable	35,529	26,568
Deferred costs	17,909	16,134
Inventories and supplies	161,792	152,096
Prepaid expenses and other current assets	48,991	41,962
Deferred tax assets	32,239	32,517
Total current assets	1,150,291	1,171,179
Property, plant and equipment, net	1,611,298	1,602,170
Other assets:
Deferred financing costs	19,284	20,860
Goodwill	578,974	570,960
Permits and other intangibles, net	553,658	569,973
Other	18,938	18,536
Total other assets	1,170,854	1,180,329
Total assets	3,932,443	3,953,678
Current liabilities:
Current portion of capital lease obligations	709	1,329
Accounts payable	262,553	316,462
Deferred revenue	61,593	55,454
Accrued expenses	245,368	236,829
Current portion of closure, post-closure and remedial liabilities	36,043	29,471
Total current liabilities	606,266	639,545
Other liabilities:
Closure and post-closure liabilities, less current portion of $6,252 and $5,884, respectively	43,630	41,201
Remedial liabilities, less current portion of $29,791 and $23,587, respectively	138,036	148,911
Long-term obligations	1,395,000	1,400,000
Capital lease obligations, less current portion	827	1,435
Deferred taxes, unrecognized tax benefits and other long-term liabilities	249,968	246,947
Total other liabilities	1,827,461	1,838,494
Common stock, $.01 par value:
Authorized 80,000,000; shares issued and outstanding 60,579,425 and 60,672,180 shares, respectively	606	607
Shares held under employee participation plan	(469)	(469)
Additional paid-in capital	889,080	898,165
Accumulated other comprehensive loss	(25,025)	(19,556)
Accumulated earnings	634,524	596,892
Total stockholders’ equity	1,498,716	1,475,639
Total liabilities and stockholders’ equity	$ 3,932,443	$ 3,953,678