ACQUISITIONS - Other acquisitions (Details) $ in Thousands	1 Months Ended			3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($)	Apr. 30, 2016 USD ($) Employee	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Business Acquisition [Line Items]
Goodwill	$ 361,961			$ 361,961		$ 361,961		$ 256,654
Loss on revaluation of contingent consideration				2,184	$ 0	2,184	$ 0
Turbinate
Business Acquisition [Line Items]
Business acquisition, purchase price	$ 8,000
QIS and TiaT
Business Acquisition [Line Items]
Business acquisition, purchase price		$ 9,000
Number of employees added | Employee		65
DK Amans Valve
Business Acquisition [Line Items]
Business acquisition, purchase price			$ 12,300
Cash and cash equivalents acquired			100		100		100
Net working capital acquired			3,000		3,000		3,000
Fixed assets acquired			600		600		600
Intangibles acquired, including goodwill			8,800		8,800		8,800
Goodwill			2,500		2,500		2,500
Business acquisition, contingent consideration			$ 1,800		1,800		1,800
Achievement of certain performance milestones period			3 years
Additional amount of contingent consideration payable based on achievement of milestones			$ 4,000		$ 4,000		$ 4,000
Loss on revaluation of contingent consideration				$ 2,184		$ 2,184