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Loss on Excess Office Facilities (Tables)
 12 Months Ended
Dec. 31, 2012
Disclosure Changes To Accrued Loss On Excess Office Facilities [Abstract]  
Changes to Accrued Loss on Excess Office Facilities
Changes to the accrued loss on excess office facilities (in thousands):
 
 
Years Ended December 31,
 
 
2012
2011
2010
Accrued loss, beginning of year
 
$
2,747

$
4,524

$
3,228

Additions and adjustments to the lease loss accrual, including sublease income estimate revision, and related asset write-downs
 
3,290

(646
)
7,396

Less write-down of leasehold improvements
 
(496
)
—

(1,552
)
Less amounts paid, net of sublease income
 
(1,328
)
(1,131
)
(4,548
)
Accrued loss, end of year
 
4,213

2,747

4,524

Less current portion (included in Accrued and other current liabilities)
 
(2,463
)
(596
)
(1,144
)
Accrued loss, non-current portion (included in Other long term liabilities)
 
$
1,750

$
2,151

$
3,380