Other Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Other accrued liabilities
Deferred revenue	$ 14,852		$ 14,304
Accrued health insurance	4,791		5,194
Deferred rent	4,635		4,535
Accrued other insurance	4,185		4,381
Miscellaneous accrued taxes	3,522	[1]	3,025	[1]
Accrued accounting and legal fees	2,447		2,900
Accrued workers' compensation	2,548		2,781
Holdbacks and earn-outs	8,824		7,878
Customer deposits	2,442		2,229
Accrued consulting fees	3,333		3,172
Accrued lease payments	1,638		1,657
Other	16,762		15,163
Other accrued liabilities	$ 69,979		$ 67,219

[1] Includes property, sales and use taxes.