Accrued Liabilities (Tables)

12 Months Ended

Dec. 31, 2011

Accrued Liabilities

Schedule of accrued liabilities

	As of December 31,
	2011		2010
Compensation and benefits	$	45,418	$	39,766
Customer advances		1,077		1,024
Deferred revenue		18,916		18,227
Taxes, other than income		9,749		6,982
Liabilites assumed in business combinations		6,122		1,450
Accrued contract costs		11,461		19,941
Accrued interest		8,694		9,668
Other		43,234		39,867
	$	144,671	$	136,925