Other Accrued Liabilities (Details) - USD ($) $ in Thousands		Sep. 30, 2015	Dec. 31, 2014
Other accrued liabilities
Deferred revenue		$ 16,526	$ 14,304
Accrued health insurance		5,113	5,194
Deferred rent		4,702	4,535
Accrued other insurance		4,735	4,381
Miscellaneous accrued taxes	[1]	4,446	3,025
Accrued accounting and legal fees		2,952	2,900
Accrued workers' compensation		5,856	2,781
Holdbacks and earn-outs		10,629	7,878
Customer deposits		2,129	2,229
Accrued consulting fees		3,655	3,172
Accrued lease payments		1,378	1,657
Other		13,058	15,163
Other accrued liabilities		$ 75,179	$ 67,219

[1] Includes property, sales and use taxes.