Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2011

Commitments and Contingencies [Abstract]

Commitments Under Operating Leases

The estimated future minimum noncancelable lease commitments under operating leases were as follows:

December 31,	Facilities	Equipment	Total
2012	$6,072	$1,188	$7,260
2013	7,304	258	7,562
2014	7,428	35	7,463
2015	7,583		7,583
2016	7,738		7,738
Thereafter	59,631	___	59,631
	$95,756	$1,481	$97,237

Rent Expense Under Operating Leases

Rent expense under operating leases was:

Year Ending December 31,	Facilities	Equipment	Total
2011	$7,191	$599	$7,790
2010	7,301	335	7,636
2009	7,722	395	8,117

Commitments Under Capital Leases

The estimated future minimum noncancelable lease commitments under capital leases were as follows:

December 31,	Equipment
2012	$1,394
2013	1,254
2014	130
Total minimum lease payments	2,778
Less: amount representing interest	(272)
	$2,506

Commitments Under Facility Lease Obligations

The estimated future minimum noncancelable commitments under these facility lease obligations, as of December 31, 2011, were as follows:

December 31,	Buildings A and B	Building C	Total
2012	$12,847	$2,825	$15,672
2013	13,092	4,370	17,462
2014	13,343	4,490	17,833
2015	13,600	4,614	18,214
2016	13,864	4,740	18,604
Thereafter	113,040	39,899	152,939
	$179,786	$60,938	$240,724