Other Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Other accrued liabilities
Deferred revenue	$ 11,102		$ 11,190
Accrued health insurance	4,241		5,479
Deferred rent	4,023		4,331
Accrued other insurance	4,048		4,381
Miscellaneous accrued taxes	3,574	[1]	2,804	[1]
Accrued workers' compensation	3,757		3,267
Holdbacks and earnouts	3,150		3,040
Customer deposits	2,830		3,075
Accrued consulting fees	3,123		3,028
Accrued lease payments	2,268		2,547
Other	12,714		15,620
Other accrued liabilities	$ 54,830		$ 58,762

[1] Includes property, sales and use taxes.