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Restructuring and Exit Activities (Tables)
 9 Months Ended
Sep. 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
 
Nine Months Ended
 
September 30,
 
September 30,
 
2014
 
2013
 
2014
 
2013
Balance at beginning of period
$
15,559

 
$
16,677

 
$
16,090

 
$
17,263

Employee, office and other costs accrued, net
18

 
2

 
27

 
5

Accretion of firm transportation obligation
407

 
410

 
991

 
1,263

Cash payments, net
(857
)
 
(705
)
 
(1,981
)
 
(2,147
)
Balance at end of period
$
15,127

 
$
16,384

 
$
15,127

 
$
16,384