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Supplemental Information to Consolidated Financial Statements
 12 Months Ended
Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]  
Summarized Quarterly Financial Data
 Quarterly Financial Data—(in thousands, except per share amounts)
 
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
Year ended December 31, 2012:
 
 

 
 

 
 

 
 

Revenues
 
$
70,474

 
$
62,328

 
$
65,998

 
$
67,420

Income (loss) from operations
 
721

 
(6,121
)
 
(54,517
)
 
(15,915
)
Net loss
 
(58,853
)
 
(76,003
)
 
(111,876
)
 
(98,909
)
Net loss attributable to common stockholders
 
(56,415
)
 
(73,040
)
 
(109,001
)
 
(94,324
)
Net loss per share—basic and diluted
 
(0.43
)
 
(0.43
)
 
(0.52
)
 
(0.44
)
 
 
 
 
 
 
 
 
 
Year ended December 31, 2011:
 
 

 
 

 
 

 
 

Revenues
 
$
79,231

 
$
72,810

 
$
65,813

 
$
72,590

Income from operations
 
23,566

 
16,461

 
10,355

 
7,764

Net loss
 
(40,479
)
 
(48,456
)
 
(55,469
)
 
(58,934
)
Net loss attributable to common stockholders
 
(39,838
)
 
(47,171
)
 
(53,936
)
 
(57,811
)
Net loss per share—basic and diluted
 
(0.60
)
 
(0.67
)
 
(0.67
)
 
(0.54
)