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Goodwill and Other Intangible Assets (Details Textual) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Finite-Lived Intangible Assets [Line Items]    
Amortization expense $ 5.1 $ 4.3
Facility management contracts and customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Weighted average period 1 year 9 months 55 days