Other Accrued Liabilities (Details) - USD ($) $ in Thousands		Jun. 30, 2015	Dec. 31, 2014
Other accrued liabilities
Deferred revenue		$ 15,967	$ 14,304
Accrued health insurance		4,910	5,194
Deferred rent		4,648	4,535
Accrued other insurance		4,397	4,381
Miscellaneous accrued taxes	[1]	4,597	3,025
Accrued accounting and legal fees		2,609	2,900
Accrued workers' compensation		2,938	2,781
Holdbacks and earn-outs		9,247	7,878
Customer deposits		2,590	2,229
Accrued consulting fees		3,494	3,172
Accrued lease payments		1,496	1,657
Other		16,200	15,163
Other accrued liabilities		$ 73,093	$ 67,219

[1] Includes property, sales and use taxes.