Intangible Assets, net (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Intangible assets, net
Accumulated amortization	$ 31,557		$ 31,557		$ 20,181
Intangible assets, net	94,846		94,846		106,222
Amortization expense	3,779	3,877	11,376	12,853
Covenant not to compete
Intangible assets, net
Intangible assets	933		933		933
Trade names and trademarks
Intangible assets, net
Intangible assets	9,820		9,820		9,820
Proprietary know how
Intangible assets, net
Intangible assets	34,650		34,650		34,650
Management contract rights
Intangible assets, net
Intangible assets	$ 81,000		$ 81,000		$ 81,000