Other Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Other accrued liabilities
Deferred revenue	$ 11,438		$ 11,190
Accrued health insurance	4,234		5,479
Deferred rent	4,027		4,331
Accrued other insurance	4,048		4,381
Miscellaneous accrued taxes	4,135	[1]	2,804	[1]
Accrued workers' compensation	4,513		3,267
Holdbacks and earnouts	2,930		3,040
Customer deposits	1,393		3,075
Accrued consulting fees	3,217		3,028
Accrued lease payments	1,983		2,547
Other	11,250		15,620
Other accrued liabilities	$ 53,168		$ 58,762

[1] Includes property, sales and use taxes.