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Quarterly Results of Operations (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2012
Quarterly Results of Operations (Unaudited) [Abstract]  
Quarterly results of operations
The following is a summary of quarterly results of operations for each of the fiscal quarters in 2012 and 2011 (in thousands, except per share amounts):

 
For the Quarters Ended
 
 
March 31,
2012
 
 
June 30,
2012
 
 
September 30,
2012
 
 
December 31,
2012
 
Revenues
 
$
682,708
 
 
$
690,473
 
 
$
696,145
 
 
$
699,412
 
Income from operations(1)
 
 
26,523
 
 
 
18,528
 
 
 
24,269
 
 
 
11,619
 
Loss before income taxes
 
 
(9,614
)
 
 
(18,133
)
 
 
(11,469
)
 
 
(25,732
)
Net loss
 
 
(10,544
)
 
 
(19,015
)
 
 
(12,216
)
 
 
(24,692
)
Weighted average basic and diluted loss per share
 
$
(0.09
)
 
$
(0.16
)
 
$
(0.10
)
 
$
(0.20
)
Weighted average shares used in computing basic and diluted loss per share
 
 
121,145
 
 
 
121,708
 
 
 
122,493
 
 
 
122,608
 


 
For the Quarters Ended
 
 
March 31,
2011
 
 
June 30,
2011
 
 
September 30,
2011
 
 
December 31,
2011
 
Revenues
 
$
586,557
 
 
$
582,936
 
 
$
615,365
 
 
$
671,625
 
Income from operations(1)
 
 
11,637
 
 
 
28,500
 
 
 
29,142
 
 
 
19,466
 
Loss before income taxes
 
 
(23,822
)
 
 
(21,594
)
 
 
(6,886
)
 
 
(14,968
)
Net loss
 
 
(12,526
)
 
 
(34,181
)
 
 
(7,257
)
 
 
(15,086
)
Weighted average basic and diluted loss per share
 
$
(0.10
)
 
$
(0.28
)
 
$
(0.06
)
 
$
(0.12
)
Weighted average shares used in computing basic and diluted loss per share
 
 
120,792
 
 
 
121,280
 
 
 
121,616
 
 
 
120,951
 



(1)Fourth quarter 2012 and 2011 results include non-cash impairment charges of $19.3 million and $2.0 million, respectively. Second quarter 2012 results include non-cash impairment charges of $7.2 million. First quarter 2012 and 2011 results include non-cash impairment charges of $1.1 million and $14.8 million, respectively.