Fair Value of Financial Instruments (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) Letter	Dec. 31, 2018 USD ($)
Performance Bond [Abstract]
Number of standby letters of credit | Letter	4
Letter of credit and surety bonds	$ 1,900
Assets and liabilities measured at fair value [Abstract]
Money market funds	825	$ 824
Foreign exchange contracts	145	43
Total assets	970	867
Liability awards	(232)	(118)
Interest rate swap contract	(128)	(103)
Total liabilities	(360)	(221)
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets and liabilities measured at fair value [Abstract]
Money market funds	825	824
Foreign exchange contracts	0	0
Total assets	825	824
Liability awards	0	0
Interest rate swap contract	0	0
Total liabilities	0	0
Significant Other Observable Inputs (Level 2) [Member]
Assets and liabilities measured at fair value [Abstract]
Money market funds	0	0
Foreign exchange contracts	145	43
Total assets	145	43
Liability awards	(232)	(118)
Interest rate swap contract	(128)	(103)
Total liabilities	(360)	(221)
Significant Unobservable Inputs (Level 3) [Member]
Assets and liabilities measured at fair value [Abstract]
Money market funds	0	0
Foreign exchange contracts	0	0
Total assets	0	0
Liability awards	0	0
Interest rate swap contract	0	0
Total liabilities	0	$ 0
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	0
Issuance of contingent consideration in connection with acquisitions	1,200
Change in fair value	(1,200)
Ending balance	$ 0