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Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Schedule of Finite and Indefinite-Lived Intangible Assets [Line Items]    
Accumulated Amortization $ (82,735) $ (68,516)
Net Carrying Amount 184,127  
Gross carrying amount 312,062 223,791
Total acquired intangible assets $ 229,327 155,275
Facility management contracts and customer relationships    
Schedule of Finite and Indefinite-Lived Intangible Assets [Line Items]    
Weighted Average Useful Life (years) 15 years 7 months 6 days  
Gross Carrying Amount $ 233,162 154,591
Accumulated Amortization (67,640) (56,396)
Net Carrying Amount $ 165,522 98,195
Technology    
Schedule of Finite and Indefinite-Lived Intangible Assets [Line Items]    
Weighted Average Useful Life (years) 7 years 3 months 18 days  
Gross Carrying Amount $ 33,700 24,000
Accumulated Amortization (15,095) (12,120)
Net Carrying Amount 18,605 11,880
Trade names    
Schedule of Finite and Indefinite-Lived Intangible Assets [Line Items]    
Accumulated Amortization 0 0
Trade name (Indefinite lived) $ 45,200 $ 45,200