Other Intangible Assets

12 Months Ended

Dec. 31, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Other intangible assets are as follows (in thousands):



	December 31,
	2015				2014
	Cost		Accumulated Amortization		Cost		Accumulated Amortization
Finite lived intangible assets:
Patents and technology	$	20,960	$	5,809	$	20,061	$	4,569
Customer lists	52,607		14,640		52,607		11,829
Trademarks and brand names	7,191		3,360		7,191		2,706
Total finite lived intangible assets acquired	80,758		23,809		79,859		19,104
Deferred financing costs	1,665		858		1,655		512
Total amortizable intangible assets	82,423		$	24,667	81,514		$	19,616
Indefinite lived intangible assets:
Trademarks and brand names	11,630				11,630
Total other intangible assets	$	94,053			$	93,144

Carrying value:
Other intangible assets, net	$	69,386			$	73,528

Intangible assets acquired are amortized on a straight-line basis over two to 20 years. Amortization of intangible assets acquired totaled $4.8 million, $4.8 million, and $3.9 million for the years end ended December 31, 2015, 2014, and 2013, respectively.

Amortization of deferred financing costs totaled $0.3 million, $0.3 million, and $0.2 million for the years ended December 31, 2015, 2014, and 2013, respectively.

Estimated future amortization expense for other intangible assets, including deferred financing costs, at December 31, 2015 is as follows (in thousands):



Year ending December 31,
2016	$	4,925
2017	4,770
2018	4,499
2019	4,297
2020	4,277
Thereafter	34,988
Other intangible assets, net	$	57,756

During the years ended December 31, 2015, 2014 and 2013, no impairments were recognized related to other intangible assets.