Business Segments (Tables)

12 Months Ended

Dec. 31, 2012

Financial Information of Business Segments

Communication Services, including emergency communications, automated call processing, telephony / interconnect services and agent-based services.

	For the year ended December 31,
	2012			2011			2010
Revenue:
Unified Communications	$	1,451,301		$	1,364,032		$	1,220,216
Communication Services		1,198,320			1,137,900			1,173,945
Intersegment eliminations		(11,597	)		(10,607	)		(5,950	)
Total	$	2,638,024		$	2,491,325		$	2,388,211
Depreciation and Amortization
(Included in Operating Income):
Unified Communications	$	88,253		$	85,566		$	87,278
Communication Services		94,169			86,342			83,052
Total	$	182,422		$	171,908		$	170,330
Operating Income:
Unified Communications	$	384,565		$	363,226		$	320,411
Communication Services		93,610			104,902			99,770
Total	$	478,175		$	468,128		$	420,181
Capital Expenditures:
Unified Communications	$	63,236		$	61,063		$	51,077
Communication Services		55,519			46,952			50,515
Corporate		9,674			12,107			20,457
Total	$	128,429		$	120,122		$	122,049

	As of December 31,
	2012		2011		2010
Assets:
Unified Communications	$	1,629,019	$	1,620,444	$	1,401,242
Communication Services		1,437,695		1,379,125		1,375,643
Corporate		381,439		227,949		228,365
Total	$	3,448,153	$	3,227,518	$	3,005,250

Geographic Information by Organizational Region

Geographic information by organizational region, in thousands, is noted below.

	2012		2011		2010
Revenue:
Americas—United States	$	2,149,971	$	2,018,179	$	1,979,372
Europe, Middle East & Africa (EMEA)		296,705		292,397		263,603
Asia-Pacific		168,046		154,238		125,267
Americas—Other		23,302		26,511		19,969
Total	$	2,638,024	$	2,491,325	$	2,388,211

	As of December 31,
	2012		2011		2010
Long-Lived Assets:
Americas—United States	$	2,446,090	$	2,373,428	$	2,192,157
Europe, Middle East & Africa (EMEA)		210,902		206,598		210,689
Asia-Pacific		27,787		21,599		19,646
Americas—Other		2,282		4,107		5,731
Total	$	2,687,061	$	2,605,732	$	2,428,223