Supplemental Cash Flow Information (Tables)

12 Months Ended

Dec. 31, 2011

Supplemental Cash Flow Information

Schedule of supplemental cash flow information

	2009		2010		2011
Income taxes paid, net of refunds	$	16,599	$	61,861	$	50,324
Interest paid	$	1,470	$	1,685	$	1,521
Assets acquired through capital leases	$	—	$	1,680	$	—