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Other Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Other accrued liabilities    
Other Accrued Liabilities
Other accrued liabilities consisted of the following (in thousands):
 
 
 
As of December 31,
 
 
2012
 
2011
Deferred revenue
 
$
10,811

 
$
7,025

Accrued health insurance
 
6,409

 
5,553

Deferred rent
 
4,165

 
3,626

Holdbacks and earn-outs
 
3,599

 
2,250

Miscellaneous accrued taxes (1)
 
3,485

 
2,015

Customer deposits
 
3,140

 
2,281

Accrued consulting fees
 
3,114

 
2,886

Accrued lab service rebates
 
579

 
332

Other
 
21,829

 
18,000

 
 
$
57,131

 
$
43,968


(1) Includes property, sales, and use taxes.
  
Deferred revenue $ 10,811 $ 7,025
Accrued health insurance 6,409 5,553
Deferred rent 4,165 3,626
Holdbacks And Earn Outs Current 3,599 2,250
Accrual for Taxes Other than Income Taxes 3,485 2,015
Customer deposits 3,140 2,281
Accrued consulting fees 3,114 2,886
Accrued lab service rebates 579 332
Other 21,829 18,000
Other accrued liabilities $ 57,131 $ 43,968