Goodwill and Other Intangible Assets (Details Textual) (USD $)	1 Months Ended	3 Months Ended
	Feb. 25, 2014	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Purchase price	$ 13,000,000
Amortization expense		3,600,000	3,700,000
Intangible Assets, Net (Excluding Goodwill)	7,400,000	167,133,000		163,400,000
Goodwill	$ 3,700,000	$ 493,911,000		$ 490,196,000
Facility management contracts
Finite-Lived Intangible Assets [Line Items]
Weighted average period		1 year 4 months 24 days