Goodwill and Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		1 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Dec. 31, 2014	Feb. 25, 2015
Changes in carrying amount of goodwill [Abstract]
Balance, beginning of period	$ 214,374
Increase due to DR Systems acquisition	52,889
Balance, end of period	267,263		267,263
Other Intangible Assets [Abstract]
Gross carrying amount	142,027		142,027	94,675
Accumulated amortization	65,073		65,073	62,134
Estimated aggregate amortization expense [Abstract]
For the remaining nine months of the year ending December 31: 2015	11,061		11,061
For the year ending December 31: 2016	13,392		13,392
For the year ending December 31: 2017	11,068		11,068
For the year ending December 31: 2018	8,806		8,806
For the year ending December 31: 2019	6,914		6,914
Thereafter	25,713		25,713
Total	76,954		76,954
Amortization Included In Cost Of Sales And Operating Expenses [Abstract]
Total amortization	2,939	3,272
DR Systems, Inc. [Member]
Amortization Included In Cost Of Sales And Operating Expenses [Abstract]
Total amortization			388
Amortization included in cost of sales [Member]
Amortization Included In Cost Of Sales And Operating Expenses [Abstract]
Total amortization	1,370	1,359
Amortization included in operating expenses [Member]
Amortization Included In Cost Of Sales And Operating Expenses [Abstract]
Total amortization	1,569	1,913
Purchased Software And Technology [Member]
Other Intangible Assets [Abstract]
Weighted average remaining amortization period (years)	7 years 10 months 24 days
Gross carrying amount	61,137		61,137	32,497
Accumulated amortization	22,872		22,872	21,706
Purchased Software And Technology [Member] | DR Systems, Inc. [Member]
Amortization Included In Cost Of Sales And Operating Expenses [Abstract]
Increase in intangible assets during the period	28,640
Purchased Software And Technology [Member] | Amortization included in cost of sales [Member]
Amortization Included In Cost Of Sales And Operating Expenses [Abstract]
Total amortization	1,166	1,258
Capitalized Software [Member]
Other Intangible Assets [Abstract]
Weighted average remaining amortization period (years)	4 years 6 months
Gross carrying amount	6,244		6,244	5,852
Accumulated amortization	2,261		2,261	2,058
Capitalized Software [Member] | DR Systems, Inc. [Member]
Amortization Included In Cost Of Sales And Operating Expenses [Abstract]
Increase in intangible assets during the period	393
Capitalized Software [Member] | Amortization included in cost of sales [Member]
Amortization Included In Cost Of Sales And Operating Expenses [Abstract]
Total amortization	204	43
Customer Relationships [Member]
Other Intangible Assets [Abstract]
Weighted average remaining amortization period (years)	8 years 6 months
Gross carrying amount	61,284		61,284	43,664
Accumulated amortization	28,836		28,836	27,440
Customer Relationships [Member] | DR Systems, Inc. [Member]
Amortization Included In Cost Of Sales And Operating Expenses [Abstract]
Increase in intangible assets during the period	17,620
Customer Relationships [Member] | Amortization included in operating expenses [Member]
Amortization Included In Cost Of Sales And Operating Expenses [Abstract]
Total amortization	1,396	1,758
Backlog [Member]
Other Intangible Assets [Abstract]
Weighted average remaining amortization period (years)	0 years
Gross carrying amount	8,100		8,100	8,100
Accumulated amortization	8,100		8,100	8,100
Backlog [Member] | Amortization included in cost of sales [Member]
Amortization Included In Cost Of Sales And Operating Expenses [Abstract]
Total amortization	0	58
Trade Names [Member]
Other Intangible Assets [Abstract]
Weighted average remaining amortization period (years)	4 years 7 months 6 days
Gross carrying amount	1,883		1,883	1,463
Accumulated amortization	821		821	764
Trade Names [Member] | DR Systems, Inc. [Member]
Amortization Included In Cost Of Sales And Operating Expenses [Abstract]
Increase in intangible assets during the period	420
Trade Names [Member] | Amortization included in operating expenses [Member]
Amortization Included In Cost Of Sales And Operating Expenses [Abstract]
Total amortization	57	40
Non-competes [Member]
Other Intangible Assets [Abstract]
Weighted average remaining amortization period (years)	2 years 6 months
Gross carrying amount	3,379		3,379	3,099
Accumulated amortization	2,183		2,183	2,066
Non-competes [Member] | DR Systems, Inc. [Member]
Amortization Included In Cost Of Sales And Operating Expenses [Abstract]
Increase in intangible assets during the period	280
Non-competes [Member] | Amortization included in operating expenses [Member]
Amortization Included In Cost Of Sales And Operating Expenses [Abstract]
Total amortization	116	115
Healthcare [Member]
Changes in carrying amount of goodwill [Abstract]
Balance, beginning of period	194,115
Increase due to DR Systems acquisition	52,889
Balance, end of period	247,004		247,004
Healthcare [Member] | DR Systems, Inc. [Member]
Changes in carrying amount of goodwill [Abstract]
Balance, beginning of period					52,889
Balance, end of period					52,889
DNA [Member]
Changes in carrying amount of goodwill [Abstract]
Balance, beginning of period	20,259
Increase due to DR Systems acquisition	0
Balance, end of period	$ 20,259		$ 20,259