Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Goodwill
Balance at the beginning of the period			$ 335,577
Acquisitions			1,018
Balance at the end of the period	$ 336,595		336,595
Other intangible assets
Cost	151,338		151,338		$ 149,862
Accumulated Amortization	(117,156)		(117,156)		(108,057)
Total	34,182		34,182		41,805
Accumulated Impairment	(34,900)		(34,900)		(34,900)
Cost	317,338		317,338		315,862
Net	165,282		165,282		172,905
Total amortization expense	3,000	$ 3,100	9,100	$ 9,700
Trade names
Other intangible assets
Cost	166,000		166,000		166,000
Accumulated Impairment	(34,900)		(34,900)		(34,900)
Net	131,100		131,100		131,100
Customer relationship
Other intangible assets
Cost	117,039		117,039		115,731
Accumulated Amortization	(87,499)		(87,499)		(80,704)
Total	29,540		29,540		35,027
Supply agreement
Other intangible assets
Cost	26,000		26,000		26,000
Accumulated Amortization	(21,643)		(21,643)		(19,464)
Total	4,357		4,357		6,536
Technology databases
Other intangible assets
Cost	7,217		7,217		7,217
Accumulated Amortization	(7,217)		(7,217)		(7,217)
Non-compete agreements
Other intangible assets
Cost	948		948		780
Accumulated Amortization	(663)		(663)		(538)
Total	285		285		242
Favorable lease agreements
Other intangible assets
Cost	134		134		134
Accumulated Amortization	(134)		(134)		$ (134)
Medical Equipment Solutions
Goodwill
Balance at the beginning of the period			227,486
Balance at the end of the period	227,486		227,486
Clinical Engineering Solutions
Goodwill
Balance at the beginning of the period			$ 55,655
Acquisitions
Balance at the end of the period	55,655		$ 55,655
Surgical Services
Goodwill
Balance at the beginning of the period			52,436
Acquisitions			1,018
Balance at the end of the period	$ 53,454		$ 53,454