Other Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Other accrued liabilities
Deferred revenue	$ 21,400	$ 14,647
Holdbacks and earn-outs	20,823	9,959
Accrued other insurance	6,169	5,013
Deferred rent	5,347	4,791
Accrued health insurance	4,818	4,952
Accrued workers' compensation	3,733	3,212
Customer deposits	3,168	2,971
Miscellaneous accrued taxes	2,966	3,317
Accrued accounting and legal fees	2,508	2,697
Accrued lease payments	1,409	1,536
Other	19,442	17,733
Other accrued liabilities	$ 91,783	$ 70,828