Intangible Assets, net

9 Months Ended

Sep. 30, 2015

4. Intangible Assets, net

The following presents a summary of intangible assets, net:

		September 30, 2015 (unaudited)							December 31, 2014
	Weighted Average Life (in Years)	Acquired Intangibled 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	$	(889	)	$	44	$	933	$	(879	)	$	54
Trade names and trademarks	4.4	9,770		(7,243		)	2,527		9,770		(5,487		)	4,283
Proprietary know how	9.9	34,650		(23,073		)	11,577		34,650		(17,358		)	17,292
Management contract rights	16.0	81,000		(15,477		)	65,523		81,000		(11,601		)	69,399

Acquired intangible assets, net (2)	13.8	$	126,353	$	(46,682	)	$	79,671	$	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				Nine Months Ended
	September 30, 2015		September 30, 2014		September 30, 2015		September 30, 2014
Amortization expense related to intangible assets included in depreciation and amortization	$	3,783	$	3,779	$	11,357	$	11,376