Selected Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2012

Selected Quarterly Financial Data

Schedule of quarterly financial information

			Three Months Ended							Year Ended
		March 31,		June 30,		September 30,		December 31,		December 31,
	2012:
	Operating revenues	$	696,517	$	697,734	$	713,335	$	768,374	$	2,875,960
	Cost of operations (1)		170,985		172,384		184,904		194,206		722,479
	Operating income		274,446		270,486		295,552		279,235		1,119,719
	Net income		210,358		33,689		231,825		118,153		594,025
	Net income attributable to American Tower Corporation		221,306		48,209		232,089		135,679		637,283
	Basic net income per common share		0.56		0.12		0.59		0.34		1.61
	Diluted net income per common share		0.56		0.12		0.58		0.34		1.60
			Three Months Ended							Year Ended
		March 31,		June 30,		September 30,		December 31,		December 31,
	2011:
	Operating revenues	$	562,695	$	597,235	$	630,403	$	653,199	$	2,443,532
	Cost of operations (1)		135,328		151,077		168,933		165,618		620,956
	Operating income		218,300		225,789		228,305		247,738		920,132
	Net income (loss)		91,961		113,171		(19,726)		196,434		381,840
	Net income (loss) attributable to American Tower Corporation		91,842		115,211		(15,701)		205,110		396,462
	Basic net income (loss) per common share		0.23		0.29		(0.04)		0.52		1.00
	Diluted net income (loss) per common share		0.23		0.29		(0.04)		0.52		0.99
(1)	Represents operating expenses, exclusive of depreciation, amortization and accretion, selling, general, administrative and development expense, and other operating expense.