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Selected Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]  
Selected Quarterly Financial Data
Year ended Year ended December 31, 2012
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
Total
Revenues
$
49,831

 
$
47,884

 
$
43,549

 
$
56,363

 
$
197,627

Operating (loss)/income
(4,182
)
 
(2,885
)
 
(50,689
)
 
1,360

 
(56,396
)
Net (loss)/income
$
(3,613
)
 
$
(2,704
)
 
$
(50,878
)
 
$
1,110

 
$
(56,085
)
(Loss)/earnings per share—basic and diluted
$
(0.05
)
 
$
(0.04
)
 
$
(0.76
)
 
$
0.02

 
$
(0.83
)
Weighted average common shares outstanding
 
 
 
 
 
 
 
 
 
Basic
67,065,741

 
67,224,593

 
67,271,211

 
67,330,288

 
67,231,463

Diluted
67,065,741

 
67,224,593

 
67,271,211

 
67,621,961

 
67,231,463

Year ended Year ended December 31, 2011
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
Total
Revenues
$
52,675

 
$
54,860

 
$
52,204

 
$
61,694

 
$
221,433

Operating loss
(6,776
)
 
(2,486
)
 
(9,294
)
 
(38
)
 
(18,594
)
Net (loss)/income
$
(7,077
)
 
$
(2,938
)
 
$
(9,701
)
 
$
4,197

 
$
(15,519
)
(Loss)/earnings per share—basic and diluted
$
(0.13
)
 
$
(0.05
)
 
$
(0.18
)
 
$
0.07

 
$
(0.28
)
Weighted average common shares outstanding
 
 
 
 
 
 
 
 
 
Basic
54,715,573

 
54,765,846

 
54,989,823

 
59,014,889

 
55,880,896

Diluted
54,715,573

 
54,765,846

 
54,989,823

 
59,605,829

 
55,880,896

Note: Basic and diluted earnings per share are computed independently for each quarter and full year presented. Accordingly, the sum of the quarterly earnings per share data may not agree with the calculated full year earnings per share.