Acquisition (Details 2) (Central, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Oct. 02, 2012	Sep. 30, 2012
Preliminary values of assets acquired and liabilities assumed
Net current liabilities		$ (52,475)
Leasehold improvements, equipment, land and construction in progress, net		24,154
Other noncurrent assets		17,748
Long-term debt		(237,223)
Unfavorable lease contracts		(69,316)
Other noncurrent liabilities		(19,523)
Net deferred tax liability		(82)
Net liabilities assumed		(152,567)
Goodwill		302,236
Total consideration transferred		149,669	149,669
Amortization period for unfavorable lease contracts	7 years
Management contracts
Preliminary values of assets acquired and liabilities assumed
Identified intangible assets:		81,000
Weighted average useful lives of identified intangible assets	16 years
Favorable lease contracts
Preliminary values of assets acquired and liabilities assumed
Identified intangible assets:		51,650
Weighted average useful lives of identified intangible assets	10 years
Trade name / Trademarks
Preliminary values of assets acquired and liabilities assumed
Identified intangible assets:		14,900
Weighted average useful lives of identified intangible assets	7 years
Existing Technology
Preliminary values of assets acquired and liabilities assumed
Identified intangible assets:		34,000
Weighted average useful lives of identified intangible assets	4 years 6 months
Non-competition Agreements
Preliminary values of assets acquired and liabilities assumed
Identified intangible assets:		$ 2,600
Weighted average useful lives of identified intangible assets	1 year