Intangible Assets, net

6 Months Ended

Jun. 30, 2015

4. Intangible Assets, net

The following presents a 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.

	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