Summary of Fair Values of Assets Acquired and Liabilities Assumed Purchase Price Allocation (Details) - USD ($) $ in Thousands			12 Months Ended
	May 24, 2016	Mar. 14, 2014	Dec. 31, 2015	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill			$ 103,456	$ 108,128
Less: contingent consideration			3,889	$ 2,381
Reach Technology Inc.
Business Acquisition [Line Items]
Cash	$ 238
Accounts receivable	991
Inventory	1,611
Prepaid expenses and other current assets	12
Intangible assets	3,953
Goodwill	4,715
Total assets acquired	11,520
Accounts payable	280
Other liabilities	148
Deferred tax liabilities	1,474
Total liabilities assumed	1,902
Total assets acquired, net of liabilities assumed	9,618
Less: cash acquired	238
Total purchase price, net of cash acquired	$ 9,380
Skyetek, Lincoln Laser and Applimotion
Business Acquisition [Line Items]
Cash			331
Accounts receivable			3,166
Inventory			3,544
Prepaid expenses and other current assets			148
Property and equipment			3,220
Intangible assets			11,370
Goodwill			12,668
Other assets			10
Total assets acquired			34,457
Accounts payable			1,681
Other liabilities			1,197
Deferred tax liabilities			2,308
Total liabilities assumed			5,186
Total assets acquired, net of liabilities assumed			29,271
Less: cash acquired			331
Total purchase price, net of cash acquired			28,940
Less: contingent consideration			3,459
Net cash used for acquisition of businesses			$ 25,481
JADAK Acquisition
Business Acquisition [Line Items]
Cash		$ 1,140
Accounts receivable		7,907
Inventory		6,865
Property and equipment		904
Intangible assets		40,250
Goodwill		44,584
Other assets		2,064
Total assets acquired		103,714
Accounts payable		3,057
Other liabilities		2,380
Deferred tax liabilities		3,481
Total liabilities assumed		8,918
Total assets acquired, net of liabilities assumed		94,796
Less: cash acquired		1,140
Net cash used for acquisition of businesses		$ 93,656