Goodwill and Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Schedule of intangible assets
Gross carrying amount	$ 225,549	$ 225,683
Accumulated amortization	(51,076)	(47,365)
Net carrying amount	130,473
Intangible Assets, Net (Excluding Goodwill)	174,473	178,318
Facility Management Contracts
Goodwill [Line Items]
Weighted Average Useful Life (years)	13 years 4 months 24 days
Schedule of intangible assets
Gross carrying amount	151,779	151,913
Accumulated amortization	(36,020)	(33,141)
Net carrying amount	115,759	118,772
Covenants not to compete
Goodwill [Line Items]
Weighted Average Useful Life (years)	2 years
Schedule of intangible assets
Gross carrying amount	8,570	8,570
Accumulated amortization	(8,570)	(8,495)
Net carrying amount	0	75
Technology
Goodwill [Line Items]
Weighted Average Useful Life (years)	7 years
Schedule of intangible assets
Gross carrying amount	21,200	21,200
Accumulated amortization	(6,486)	(5,729)
Net carrying amount	14,714	15,471
Trade names
Schedule of intangible assets
Accumulated amortization	0	0
Trade name (Indefinite lived)	44,000	44,000
Trade name	$ 44,000	$ 44,000