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Business Segment Information (Tables)
 6 Months Ended
Jun. 30, 2013
Segment Reporting [Abstract]  
Summarized Financial Information of Segments
Summarized financial information for the Company’s segments is shown in the following table:
 
 
Exploration and
Production
 
Well Services
 
Midstream Services
 
Consolidated
 
(In thousands)
Three Months Ended June 30, 2013:
 
Revenues
$
241,842

 
$
31,382

 
$
7,035

 
$
280,259

Inter-segment revenues
—

 
(19,921
)
 
(5,756
)
 
(25,677
)
Total revenues
241,842

 
11,461

 
1,279

 
254,582

Operating income
105,459

 
3,310

 
4,681

 
113,450

Other income (expense)
(8,511
)
 
4

 
—

 
(8,507
)
Income before income taxes
96,948

 
3,314

 
4,681

 
104,943

Three Months Ended June 30, 2012:
 
 
 
 
 
 
 
Revenues
$
145,203

 
$
16,505

 
$
—

 
$
161,708

Inter-segment revenues
—

 
(12,644
)
 
—

 
(12,644
)
Total revenues
145,203

 
3,861

 
—

 
149,064

Operating income
58,735

 
1,450

 
—

 
60,185

Other income (expense)
61,297

 
—

 
—

 
61,297

Income before income taxes
120,032

 
1,450

 
—

 
121,482

Six Months Ended June 30, 2013:
 
Revenues
$
483,493

 
$
67,150

 
$
11,855

 
$
562,498

Inter-segment revenues
—

 
(49,975
)
 
(9,637
)
 
(59,612
)
Total revenues
483,493

 
17,175

 
2,218

 
502,886

Operating income
218,357

 
5,873

 
7,173

 
231,403

Other income (expense)
(43,530
)
 
8

 
—

 
(43,522
)
Income before income taxes
174,827

 
5,881

 
7,173

 
187,881

Six Months Ended June 30, 2012:
 
 
 
 
 
 
 
Revenues
$
283,109

 
$
17,749

 
$
—

 
$
300,858

Inter-segment revenues
—

 
(13,228
)
 
—

 
(13,228
)
Total revenues
283,109

 
4,521

 
—

 
287,630

Operating income
100,978

 
17,357

 
—

 
118,335

Other income (expense)
29,410

 
—

 
—

 
29,410

Income before income taxes
130,388

 
17,357

 
—

 
147,745

Total Assets:
 
As of June 30, 2013
$
2,617,366

 
$
52,209

 
$
88,569

 
$
2,758,144

As of December 31, 2012
2,475,820

 
52,974

 
—

 
2,528,794