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Assets Held for Sale (Tables)
 9 Months Ended
Sep. 30, 2016
Property, Plant and Equipment [Abstract]  
Schedule of Assets Held for Sale
The following table shows the additions, sales, impairments and gains and losses related to assets held for sale during the period (in thousands):
 
September 30, 2016
 
December 31, 2015
Balance as of beginning of period
$
1,111

 
$
—

Additions to held for sale
—

 
4,440

Realized gains (losses)
—

 
—

Impairment charge
—

 
(3,329
)
Sales and settlements, net
(113
)
 
—

Balance as of end of period
$
998


$
1,111