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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2014
Earnings Per Share [Abstract]  
Reconciliation Of Components Used To Compute Basic And Diluted Earnings (Loss) Per Common Share
 
For the Three Months Ended
September 30,
 
For the Nine Months Ended
September 30,
 
2014
 
2013
 
2014
 
2013
 
 
 
 
 
 
 
 
 
(in thousands, except per share data)
Net income (loss) attributable to Quicksilver
$
23,757

 
$
10,577

 
$
(71,171
)
 
$
193,397

Basic income allocable to participating securities (1)
(772
)
 
(312
)
 
—

 
(5,111
)
Income (loss) available to shareholders
$
22,985

 
$
10,265

 
$
(71,171
)
 
$
188,286

Weighted average common shares – basic
173,936

 
171,682

 
173,783

 
171,403

Effect of dilutive securities (2)
 
 
 
 
 
 
 
Share-based compensation awards
216

 
311

 
—

 
170

Weighted average common shares – diluted
174,152

 
171,993

 
173,783

 
171,573

Earnings (loss) per common share – basic
$
0.13

 
$
0.06

 
$
(0.41
)
 
$
1.10

Earnings (loss) per common share – diluted
$
0.13

 
$
0.06

 
$
(0.41
)
 
$
1.10


(1) 
Restricted share awards that contain nonforfeitable rights to dividends are participating securities and, therefore, should be included in computing earnings per share using the two-class method. Participating securities, however, do not participate in undistributed net losses because there is no contractual obligation to do so.
(2) 
For the three months ended September 30, 2014, 6.6 million shares associated with our stock options and 1.2 million shares associated with our unvested RSUs were antidilutive and, therefore, excluded from the diluted share calculations. For the three months ended September 30, 2013, 6.2 million shares associated with our stock options and 0.2 million shares associated with our unvested RSUs were antidilutive and, therefore, excluded from the diluted share calculations. For the nine months ended September 30, 2014, 6.6 million shares associated with our stock options and 0.8 million shares associated with our unvested RSUs were antidilutive and, therefore, excluded from the diluted share calculations. For the nine months ended September 30, 2013, 5.5 million shares associated with our stock options and 0.2 million shares associated with our unvested RSUs were antidilutive and, therefore, excluded from the diluted share calculations.