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Restructuring and Exit Activities (Tables)
 6 Months Ended
Jun. 30, 2014
Restructuring and Related Activities [Abstract]  
Summary of Restructuring Related Obligations
The following table summarizes our restructuring and exit activity-related obligations and the changes therein for the periods presented:
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2014
 
2013
 
2014
 
2013
Balance at beginning of period
$
15,806

 
$
16,972

 
$
16,090

 
$
17,263

Employee, office and other costs accrued, net
(4
)
 
—

 
9

 
—

Accretion of firm transportation obligation
230

 
649

 
584

 
856

Cash payments, net
(473
)
 
(944
)
 
(1,124
)
 
(1,442
)
Balance at end of period
$
15,559

 
$
16,677

 
$
15,559

 
$
16,677