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Business Segment Information (Tables)
 9 Months Ended
Sep. 30, 2015
Segment Reporting [Abstract]  
Summarized Financial Information of Segments
The following table summarizes financial information for the Company’s business segments for the periods presented: 
 
Exploration and
Production
 
Well Services
 
Midstream Services
 
Eliminations
 
Consolidated
 
(In thousands)
Three months ended September 30, 2015:
 
Revenues from non-affiliates
$
175,270

 
$
15,381

 
$
6,584

 
$
—

 
$
197,235

Inter-segment revenues
—

 
33,554

 
23,228

 
(56,782
)
 
—

Total revenues
175,270

 
48,935

 
29,812

 
(56,782
)
 
197,235

Operating income (loss)
(38,289
)
 
10,936

 
18,828

 
(11,401
)
 
(19,926
)
Other income (expense)
67,359

 
14

 
—

 
—

 
67,373

Income before income taxes
$
29,070

 
$
10,950

 
$
18,828

 
$
(11,401
)
 
$
47,447

 
 
Three months ended September 30, 2014:
 
 
 
 
 
 
 
 
 
Revenues from non-affiliates
$
344,706

 
$
20,925

 
$
3,028

 
$
—

 
$
368,659

Inter-segment revenues
—

 
66,298

 
10,596

 
(76,894
)
 
—

Total revenues
344,706

 
87,223

 
13,624

 
(76,894
)
 
368,659

Operating income
126,184

 
23,388

 
5,126

 
(20,595
)
 
134,103

Other income (expense)
63,968

 
—

 
—

 
—

 
63,968

Income before income taxes
$
190,152

 
$
23,388

 
$
5,126

 
$
(20,595
)
 
$
198,071

 
 
 
 
 
 
 
 
 
 
Nine months ended September 30, 2015:
 
 
 
 
 
 
 
 
 
Revenues from non-affiliates
$
563,239

 
$
27,308

 
$
17,121

 
$
—

 
$
607,668

Inter-segment revenues
—

 
131,220

 
58,994

 
(190,214
)
 
—

Total revenues
563,239

 
158,528

 
76,115

 
(190,214
)
 
607,668

Operating income (loss)
(103,065
)
 
29,554

 
44,083

 
(31,570
)
 
(60,998
)
Other income (expense)
(1,037
)
 
34

 
(44
)
 
—

 
(1,047
)
Income (loss) before income taxes
$
(104,102
)
 
$
29,588

 
$
44,039

 
$
(31,570
)
 
$
(62,045
)
 
 
Nine months ended September 30, 2014:
 
 
 
 
 
 
 
 
 
Revenues from non-affiliates
$
1,030,735

 
$
51,630

 
$
8,191

 
$
—

 
$
1,090,556

Inter-segment revenues
—

 
146,447

 
28,264

 
(174,711
)
 
—

Total revenues
1,030,735

 
198,077

 
36,455

 
(174,711
)
 
1,090,556

Operating income
602,797

 
53,137

 
15,854

 
(42,060
)
 
629,728

Other income (expense)
(98,140
)
 
75

 
—

 
—

 
(98,065
)
Income before income taxes
$
504,657

 
$
53,212

 
$
15,854

 
$
(42,060
)
 
$
531,663

 
 
As of September 30, 2015:
 
Property, plant and equipment, net
$
5,130,061

 
$
66,058

 
$
261,989

 
$
(150,533
)
 
$
5,307,575

Total assets
5,541,674

 
421,642

 
378,284

 
(616,492
)
 
5,725,108

As of December 31, 2014:
 
 
 
 
 
 
 
 
 
Property, plant and equipment, net
$
5,074,588

 
$
58,767

 
$
172,394

 
$
(118,963
)
 
$
5,186,786

Total assets
5,802,295

 
281,844

 
212,685

 
(358,412
)
 
5,938,412