Intangible Assets, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Intangible assets, net
Weighted Average Life			13 years 9 months 18 days
Acquired Intangible Assets, Gross	$ 126,353		$ 126,353		$ 126,353
Accumulated Amortization	(42,899)		(42,899)		(35,325)
Acquired Intangible Assets, Net	83,454		83,454		91,028
Amortization expense related to intangible assets included in depreciation and amortization	3,792	$ 3,796	$ 7,575	$ 7,597
Covenant not to compete
Intangible assets, net
Weighted Average Life			3 years 6 months
Acquired Intangible Assets, Gross	933		$ 933		933
Accumulated Amortization	(886)		(886)		(879)
Acquired Intangible Assets, Net	47		$ 47		54
Trade names and trademarks
Intangible assets, net
Weighted Average Life			4 years 4 months 24 days
Acquired Intangible Assets, Gross	9,770		$ 9,770		9,770
Accumulated Amortization	(6,658)		(6,658)		(5,487)
Acquired Intangible Assets, Net	3,112		$ 3,112		4,283
Proprietary know how
Intangible assets, net
Weighted Average Life			9 years 10 months 24 days
Acquired Intangible Assets, Gross	34,650		$ 34,650		34,650
Accumulated Amortization	(21,168)		(21,168)		(17,358)
Acquired Intangible Assets, Net	13,482		$ 13,482		17,292
Management contract rights
Intangible assets, net
Weighted Average Life			16 years
Acquired Intangible Assets, Gross	81,000		$ 81,000		81,000
Accumulated Amortization	(14,187)		(14,187)		(11,601)
Acquired Intangible Assets, Net	$ 66,813		$ 66,813		$ 69,399
Minimum
Intangible assets, net
Weighted Average Life			1 year
Maximum
Intangible assets, net
Weighted Average Life			19 years