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Commitments (Tables)
 12 Months Ended
Dec. 31, 2013
Commitments [Abstract]  
Future minimum lease payments for all non-cancelable operating leases
We lease certain plant, office space, and equipment for varying periods. Management expects that in the normal course of business, expiring leases will be renewed or replaced by other leases. Purchase commitments related to fixed assets at December 31, 2013 and 2012 totaled $4.4 million and $4.3 million, respectively. Capital lease commitments totaled $13.6 million and $16.9 million in 2013 and 2012 respectively. Rent expense for the years ended December 31, 2013, 2012, and 2011, was $3.5 million, $4.5 million, and $4.5 million respectively. Future minimum lease payments for all non-cancelable operating leases having a remaining term in excess of one year at December 31, 2013, are as follows:

(In thousands)
  
2014                                                                                                 
 
$
4,007
 
2015                                                                                                 
 
3,694
 
2016                                                                                                 
 
3,616
 
2017                                                                                                 
 
3,199
 
2018                                                                                                 
 
1,691
 
Thereafter                                                                                                 
 
756
 
Total                                                                                                 
 
$
16,963