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Quarterly Data (Unadited)
 12 Months Ended
Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Data (Unaudited)
QUARTERLY DATA (UNAUDITED)
Quarterly earnings data for the years ended December 31, 2012 and 2011 were as follows: 
(In thousands, except per share data)
 
2012 Quarter Ended
 
 
March 31
 
June 30
 
September 30
 
December 31
 
 
As Reported
As Revised
 
As Reported
As Revised
 
As Reported
As Revised
 
 
Revenue
 
$
203,051

$
203,051

 
$
212,775

$
212,775

 
$
181,044

$
181,044

 
$
203,374

Depletion, depreciation and amortization
 
$
14,672

$
14,672

 
$
14,862

$
14,862

 
$
14,107

$
14,107

 
$
14,374

Operating income
 
$
1,767

$
1,767

 
$
13,627

$
13,627

 
$
9,645

$
9,645

 
$
18,597

Net income
 
$
2,439

$
5,940

 
$
17,829

$
18,797

 
$
12,692

$
12,803

 
$
16,876

Comprehensive income attributable to common stockholders
 
$
2,747

$
6,248

 
$
18,091

$
19,046

 
$
13,417

$
13,497

 
$
17,116

Basic earnings per share attributable to common stockholders
 
$
0.02

$
0.05

 
$
0.16

$
0.17

 
$
0.11

$
0.11

 
$
0.14

Diluted earnings per share attributable to common stockholders
 
$
0.02

$
0.05

 
$
0.15

$
0.17

 
$
0.11

$
0.11

 
$
0.13


    
The company has recorded an immaterial error correction to recognize deferred tax benefits associated with its foreign exploration activities. For the quarters ended March 31, 2012, June 30, 2012 and September 30, 2012, the Company revised net income by $3.5 million, $1.0 million and $0.1 million, respectively, to recognize the tax benefit.
(In thousands, except per share data)
 
2011 Quarter Ended
 
 
March 31
 
June 30
 
September 30
 
December 31
Revenue
 
$
170,061

 
$
222,605

 
$
253,652

 
$
259,651

Depletion, depreciation and amortization
 
$
16,063

 
$
15,660

 
$
15,628

 
$
15,027

Operating income
 
$
40,939

 
$
49,117

 
$
44,156

 
$
20,994

Net income
 
$
36,192

 
$
42,698

 
$
40,741

 
$
24,664

Comprehensive income attributable to common stockholders
 
$
36,002

 
$
42,784

 
$
40,506

 
$
24,894

Basic earnings per share attributable to common stockholders
 
$
0.35

 
$
0.41

 
$
0.40

 
$
0.21

Diluted earnings per share attributable to common stockholders
 
$
0.34

 
$
0.39

 
$
0.37

 
$
0.21