REVENUE RECOGNITION (Tables)

12 Months Ended

Dec. 31, 2018

Revenue from Contract with Customer [Abstract]

Schedule of Disaggregation of Revenue

The following table presents our revenue disaggregated by major category and segment for the years ended December 31, 2018, 2017 and 2016, respectively:

Years Ended December 31,	Service Centers		Innovative Pumping Solutions		Supply Chain Services		Total
2018
Product sales (recognized at a point in time)	685,309		—		160,770		$	846,079
Inventory management services (recognized over contract life)	—		—		13,686		13,686
Staffing services (day-rate basis)	64,735		—		—		64,735
Customized pump production (recognized over time)	—		291,697		—		291,697
Total revenue	$	750,044	$	291,697	$	174,456	$	1,216,197

2017
Product sales (recognized at a point in time)	575,328		—		147,927		$	723,255
Inventory management services (recognized over contract life)	0		—		13,550		13,550
Staffing services (day-rate basis)	65,947		—		—		65,947
Customized pump production (recognized over time)	—		204,030		—		204,030
Total revenue	$	641,275	$	204,030	$	161,477	$	1,006,782

2016
Product sales (recognized at a point in time)	565,157		—		140,019		$	705,176
Inventory management services (recognized over contract life)	—		—		13,942		13,942
Staffing services (day-rate basis)	55,850		—		—		55,850
Customized pump production (recognized over time)	—		187,124		—		187,124
Total revenue	$	621,007	$	187,124	$	153,961	$	962,092