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Discontinued Operations (Tables)
 6 Months Ended
Jun. 30, 2014
Discontinued Operation, Additional Disclosures [Abstract]  
Carrying Amounts of Assets and Liabilities Held for Sale and Summarized Income (Loss) from Discontinued Operations, Net Of Tax
  
Three Months Ended 
 June 30
 
Six Months Ended 
 June 30
  
 
(in thousands)
2014
 
2013
 
2014
 
2013
Operating revenues
$
20,907

 
$
151,347

 
$
37,181

 
$
293,321

Operating costs and expenses
(12,568
)
 
(154,598
)
 
(22,701
)
 
(322,675
)
Income (loss) from discontinued operations
8,339

 
(3,251
)
 
14,480

 
(29,354
)
Provision (benefit) from income taxes
2,913

 
(1,300
)
 
4,939

 
(10,476
)
Net Income (Loss) from Discontinued Operations
5,426

 
(1,951
)
 
9,541

 
(18,878
)
Gain (loss) on sales of discontinued operations
358,964

 
—

 
354,227

 
(70
)
Benefit from income taxes on sales of discontinued operations
(16,075
)
 
—

 
(17,769
)
 
(24
)
Income (Loss) from Discontinued Operations, Net of Tax
$
380,465

 
$
(1,951
)
 
$
381,537

 
$
(18,924
)