Selected Income Statement Information (Tables)

12 Months Ended

Dec. 31, 2014

Selected Income Statement Information [Abstract]

Revenue from External Customers by Products and Services [Table Text Block]

The following schedule shows our revenue, costs and gross margins by services and products:

	Year Ended December 31,
(in thousands)	2014			2013			2012
Revenue:
Services	$	2,336,304		$	2,174,739		$	1,887,957
Products	1,323,320			1,112,280			894,647
Total revenue	3,659,624			3,287,019			2,782,604
Cost of Services and Products:
Services	1,742,411			1,624,483			1,418,511
Products	946,923			788,109			642,199
Unallocated expenses	111,089			108,891			94,036
Total cost of services and products	2,800,423			2,521,483			2,154,746
Gross margin:
Services	593,893			550,256			469,446
Products	376,397			324,171			252,448
Unallocated expenses	(111,089		)	(108,891		)	(94,036		)
Total gross margin	$	859,201		$	765,536		$	627,858