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Restructuring and Exit Activities (Tables)
 3 Months Ended
Mar. 31, 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
 
 
 
March 31,
 
 
 
 
 
2014
 
2013
Balance at beginning of period
 
 
 
 
$
16,090

 
$
17,263

Employee, office and other costs accrued, net
 
 
 
 
12

 
—

Accretion of firm transportation obligation
 
 
 
 
354

 
207

Cash payments, net
 
 
 
 
(650
)
 
(498
)
Balance at end of period
 
 
 
 
$
15,806

 
$
16,972