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Condensed Consolidated Statements of Net Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Revenues	$ 1,281,110	$ 1,206,478	$ 3,661,209	$ 3,473,313
Operating expenses:
Cost of operations	736,122	695,122	2,120,947	2,024,402
Selling, general and administrative	139,014	128,200	398,582	383,600
Depreciation	148,232	136,941	423,866	395,008
Amortization of intangibles	26,871	26,613	79,444	76,886
Impairments and other operating items	(1,998)	832	6,106	141,333
Operating income	232,869	218,770	632,264	452,084
Interest expense	(32,078)	(32,471)	(96,874)	(92,763)
Interest income	1,467	1,656	3,677	3,131
Other income, net	732	1,709	2,376	3,561
Foreign currency transaction gain (loss)	(132)	(1,864)	(323)	(3,502)
Income before income tax provision	202,858	187,800	541,120	362,511
Income tax provision	(52,092)	(64,390)	(126,509)	(100,220)
Net income	150,766	123,410	414,611	262,291
Plus (Less): Net loss (income) attributable to noncontrolling interests	77	(183)	(218)	(559)
Net income attributable to Waste Connections	$ 150,843	$ 123,227	$ 414,393	$ 261,732
Earnings per common share attributable to Waste Connections' common stockholders:
Basic	$ 0.57	$ 0.47	$ 1.57	$ 0.99
Diluted	$ 0.57	$ 0.47	$ 1.57	$ 0.99
Shares used in the per share calculations:
Basic	263,628,838	263,443,064	263,657,274	263,298,839
Diluted	264,394,757	264,299,472	264,376,320	264,109,383
Cash dividends per common share	$ 0.14	$ 0.12	$ 0.42	$ 0.36

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