Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill Activity

The roll-forward of activity related to our goodwill was as follows (in thousands):

	Year Ended December 31,
	2015			2014
Balance, beginning of period	$	170,773		$	136,152
Goodwill additions	4,100			46,880
Goodwill impairment	(18,156		)	—
Goodwill adjustments	(11,110		)	(12,259		)
Balance, end of period	$	145,607		$	170,773

Schedule of Finite-Lived Intangible Assets by Major Class

The gross amount of our other acquired intangible assets and the related accumulated amortization was as follows (in thousands):

	December 31,
	2015			2014
Patents, trademarks and other	$	26,947		$	25,333
Accumulated amortization	(15,804		)	(12,805		)
Net patents, trademarks and other	11,143			12,528
Customer relationships	21,245			21,739
Accumulated amortization	(8,083		)	(5,863		)
Net customer relationships	13,162			15,876
Developed technology	22,155			33,525
Accumulated amortization	(10,517		)	(7,818		)
Net developed technology	11,638			25,707
Note issuance costs	2,445			2,445
Accumulated amortization	(2,445		)	(2,445		)
Net note issuance costs	—			—
Total intangible assets included in other long-term assets	$	35,943		$	54,111

Schedule of Amortization Expense by Major Class

Amortization expense was as follows (in thousands):

	Year Ended December 31,
	2015		2014		2013
Patents, trademarks and other	$	4,265	$	5,965	$	3,553
Customer relationships	2,675		2,317		2,376
Developed technology	3,495		3,720		2,327
Note issuance costs	—		—		146
Total amortization expense	$	10,435	$	12,002	$	8,402

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

Expected amortization, without consideration for foreign currency effects, is as follows over the next five years and thereafter (in thousands):

	Patents, Trademarks and Other		Customer Relationships		Developed Technology		Total
2016	$	3,250	$	2,681	$	2,968	$	8,899
2017	3,041		2,335		1,490		6,866
2018	1,932		2,319		1,360		5,611
2019	1,844		1,828		1,360		5,032
2020	1,076		1,562		1,360		3,998
Thereafter	—		2,437		3,100		5,537
Total future amortization expense	$	11,143	$	13,162	$	11,638	$	35,943