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Restructuring Activities (Tables)
 12 Months Ended
Dec. 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 years ended December 31, 2014, 2013 and 2012:
 
2014
 
2013
 
2012
Balance at beginning of period
$
16,090

 
$
17,263

 
$
576

Employee, office and other costs accrued, net
10

 
7

 
1,284

Firm transportation charge
—

 
—

 
17,332

Accretion of obligations
1,301

 
1,674

 
570

Cash payments, net
(2,498
)
 
(2,854
)
 
(2,499
)
Balance at end of period
$
14,903

 
$
16,090

 
$
17,263