Intangible Assets, net (Tables)

6 Months Ended

Jun. 30, 2015

Intangible Assets, net

Summary of intangible assets, net

			June 30, 2015 (unaudited)					December 31, 2014
	Weighted Average Life (in Years)		Acquired Intangible Assets, Gross (1)		Accumulated Amortization	Acquired Intangible Assets, Net		Acquired Intangible Assets, Gross (1)		Accumulated Amortization		Acquired Intangible Assets, Net
Covenant not to compete	3.5	$	933	$	(886)	$	47	$	933	$	(879)	$	54
Trade names and trademarks	4.4		9,770		(6,658)		3,112		9,770		(5,487)		4,283
Proprietary know how	9.9		34,650		(21,168)		13,482		34,650		(17,358)		17,292
Management contract rights	16.0		81,000		(14,187)		66,813		81,000		(11,601)		69,399
Acquired intangible assets, net (2)	13.8	$	126,353	$	(42,899)	$	83,454	$	126,353	$	(35,325)	$	91,028

(1) Excludes the original cost and accumulated amortization of fully amortized intangible assets.

(2) Intangible assets have estimated useful lives between one and nineteen years.

Summary of amortization of intangible assets

	Three Months Ended				Six Months Ended
	June 30, 2015		June 30, 2014		June 30, 2015		June 30, 2014
Amortization expense related to intangible assets included in depreciation and amortization	$	3,792	$	3,796	$	7,575	$	7,597