Goodwill and Other Intangible Assets, Net (Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Schedule of intangible assets
Accumulated Amortization	$ (155,659)	$ (132,779)
Finite-lived intangible assets	187,160
Intangible assets, gross carrying amount	388,019	388,118
Total acquired intangible assets, Net carrying amount	232,360	255,339
Trade names
Schedule of intangible assets
Indefinite lived intangible assets	$ 45,200	45,200
Facility management contracts
Goodwill [Line Items]
Amortization period	16 years 3 months
Schedule of intangible assets
Gross Carrying Amount	$ 308,419	308,518
Accumulated Amortization	(127,481)	(106,724)
Finite-lived intangible assets	$ 180,938	201,794
Covenants not to compete
Goodwill [Line Items]
Amortization period	1 year
Schedule of intangible assets
Gross Carrying Amount	$ 700	700
Accumulated Amortization	(700)	(517)
Finite-lived intangible assets	$ 0	183
Technology
Goodwill [Line Items]
Amortization period	7 years 3 months
Schedule of intangible assets
Gross Carrying Amount	$ 33,700	33,700
Accumulated Amortization	(27,478)	(25,538)
Finite-lived intangible assets	$ 6,222	$ 8,162