Other Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Other accrued liabilities
Deferred revenue	$ 11,399		$ 11,190
Accrued health insurance	4,439		5,479
Deferred rent	4,125		4,331
Accrued other insurance	4,200		4,381
Miscellaneous accrued taxes	4,270	[1]	2,804	[1]
Accrued workers' compensation	6,828		3,267
Holdbacks and earn-outs	3,629		3,040
Customer deposits	3,314		3,075
Accrued consulting fees	3,312		3,028
Accrued lease payments	1,744		2,547
Other	17,154		15,620
Other accrued liabilities	$ 64,414		$ 58,762

[1] Includes property, sales and use taxes.