Goodwill and Other Intangible Assets, Net (Amortization Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 20,400	$ 19,300	$ 15,200
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2017	20,328
2018	17,468
2019	17,140
2020	17,141
2021	15,375
Thereafter	71,232
Finite-lived intangible assets	$ 158,684
Facility management contracts
Finite-Lived Intangible Assets [Line Items]
Weighted average period before renewal or extension	1 year 6 months 20 days
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Finite-lived intangible assets	$ 145,880	$ 161,503