CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement [Abstract]
Product revenue	$ 675,684	$ 471,506	$ 365,526
Service revenue	166,511	191,131	188,980
Total revenue	842,195	662,637	554,506
Cost of product revenue	466,155	325,271	238,072
Cost of service revenue	104,226	112,406	101,019
Total cost of revenue	570,381	437,677	339,091
Gross profit	271,814	224,960	215,415
Selling, general and administrative expenses	233,038	184,491	167,136
Change in fair value of contingent consideration	(5,786)	0	0
Bad debt expense	20,963	14,035	11,441
Acquisition and integration expenses	16,130	4,046	0
Restructuring and other expenses	7,771	5,143	7,909
Amortization of intangibles	6,671	3,957	3,376
Income (loss) from operations	(6,973)	13,288	25,553
Interest expense, net	28,197	26,067	25,542
Loss on extinguishment of debt	15,898	0	0
Income (loss) from continuing operations, before income taxes	(51,068)	(12,779)	11
Income tax provision (benefit)	2,538	(4,439)	435
Loss from continuing operations, net of income taxes	(53,606)	(8,340)	(424)
Less: Income (loss) from discontinued operations, net of income taxes	(16,048)	73,047	8,296
Net income (loss)	$ (69,654)	$ 64,707	$ 7,872
Income (loss) per common share
Loss from continuing operations, basic and diluted (in dollars per share)	$ (0.83)	$ (0.15)	$ (0.01)
Income (loss) from discontinued operations, basic and diluted (in dollars per share)	$ (0.25)	$ 1.30	$ 0.15
Income (loss), basic and diluted (in dollars per share)	$ (1.08)	$ 1.15	$ 0.14
Weighted average common shares outstanding
Weighted average common shares outstanding, basic and diluted (in shares)	64,560	56,239	54,505