Other Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Other accrued liabilities
Deferred revenue	$ 10,670	$ 10,811
Accrued health insurance	6,514	6,409
accruedotherinsurance	3,875	3,799
Deferred rent	3,770	3,604
Accrued consulting fees	2,943	3,114
Workers' Compensation Liability, Current	3,086	3,570
Holdbacks and earnouts	3,552	3,599
Taxes Payable, Current	3,546	3,485
Customer deposits	2,693	3,140
Other	22,642	15,600
Other accrued liabilities	$ 63,291	$ 57,131