Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Payables and Accruals [Abstract]
Trade accounts payable	$ 37,792	$ 40,969
Accrued salaries, vacation and benefits	22,322	21,550
Other accrued expenses	28,517	28,372
Accrued contingent consideration	0	594
Negative cash book balance	3,701	1,769
Accounts Payable and Accrued Liabilities, Current, Total	$ 92,332	$ 93,254