Other Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Other accrued liabilities
Deferred revenue	$ 14,647	$ 14,304
Accrued health insurance	4,952	5,194
Deferred rent	4,791	4,535
Accrued other insurance	5,013	4,381
Miscellaneous accrued taxes	3,317	3,025
Accrued accounting and legal fees	2,697	2,900
Accrued workers' compensation	3,212	2,781
Holdbacks and earn-outs	9,959	7,878
Customer deposits	2,971	2,229
Accrued consulting fees	0	3,172
Accrued lease payments	1,536	1,657
Other	17,733	15,163
Other accrued liabilities	$ 70,828	$ 67,219