Intangible Assets, net (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Intangible assets, net
Accumulated amortization	$ (23,983)		$ (20,181)
Intangible assets, net	102,420		106,222
Amortization expense	3,801	3,957
Covenant not to compete
Intangible assets, net
Intangible assets	933		933
Trade names and trademarks
Intangible assets, net
Intangible assets	9,820		9,820
Proprietary know how
Intangible assets, net
Intangible assets	34,650		34,650
Management contract rights
Intangible assets, net
Intangible assets	$ 81,000		$ 81,000