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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