Accounts Payable and Accrued Expenses (Tables)

12 Months Ended

Dec. 31, 2018

Payables and Accruals [Abstract]

Schedule of Accounts Payable and Accrued Expenses

Accounts payable and accrued expenses consisted of the following (in thousands): 

	December 31,
	2018		2017
Trade accounts payable	$	40,969	$	24,189
Accrued salaries, vacation and benefits	21,550		22,205
Other accrued expenses	28,372		26,256
Accrued contingent consideration	594		2,724
Negative cash book balance	1,769		2,906
	$	93,254	$	78,280