Summary of Other Long Term Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Other Liabilities Noncurrent [Abstract]
Capital lease obligations	$ 8,111	$ 9,173
Accrued pension liabilities	5,957	3,693
Accrued contingent considerations	2,381	3,889
Other	2,264	2,690
Total	$ 18,713	$ 19,445