Intangible Assets, net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Intangible assets, net
Weighted Average Life (in Years)			13 years 9 months 18 days
Acquired Intangible Assets, Gross	$ 126,353		$ 126,353		$ 126,353
Accumulated Amortization	(46,682)		(46,682)		(35,325)
Acquired Intangible Assets, Net	79,671		79,671		91,028
Amortization expense related to intangible assets included in depreciation and amortization	3,783	$ 3,779	$ 11,357	$ 11,376
Covenant not to compete
Intangible assets, net
Weighted Average Life (in Years)			3 years 6 months
Acquired Intangible Assets, Gross	933		$ 933		933
Accumulated Amortization	(889)		(889)		(879)
Acquired Intangible Assets, Net	44		$ 44		54
Trade names and trademarks
Intangible assets, net
Weighted Average Life (in Years)			4 years 4 months 24 days
Acquired Intangible Assets, Gross	9,770		$ 9,770		9,770
Accumulated Amortization	(7,243)		(7,243)		(5,487)
Acquired Intangible Assets, Net	2,527		$ 2,527		4,283
Proprietary know how
Intangible assets, net
Weighted Average Life (in Years)			9 years 10 months 24 days
Acquired Intangible Assets, Gross	34,650		$ 34,650		34,650
Accumulated Amortization	(23,073)		(23,073)		(17,358)
Acquired Intangible Assets, Net	11,577		$ 11,577		17,292
Management contract rights
Intangible assets, net
Weighted Average Life (in Years)			16 years
Acquired Intangible Assets, Gross	81,000		$ 81,000		81,000
Accumulated Amortization	(15,477)		(15,477)		(11,601)
Acquired Intangible Assets, Net	$ 65,523		$ 65,523		$ 69,399
Minimum
Intangible assets, net
Weighted Average Life (in Years)			1 year
Maximum
Intangible assets, net
Weighted Average Life (in Years)			19 years