Other Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Other accrued liabilities
Deferred revenue	$ 15,853	$ 14,647
Accrued health insurance	4,996	4,952
Deferred rent	4,998	4,791
Accrued other insurance	5,691	5,013
Miscellaneous accrued taxes	3,972	3,317
Accrued accounting and legal fees	3,772	2,697
Accrued workers' compensation	3,741	3,212
Holdbacks and earn-outs	13,072	9,959
Customer deposits	3,088	2,971
Accrued lease payments	1,763	1,536
Other	16,472	17,733
Other accrued liabilities	$ 77,418	$ 70,828