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Liabilities for Dispositions and Discontinued Operations (Tables)
 6 Months Ended
Jun. 30, 2013
Liabilities of Disposal Group, Including Discontinued Operation [Abstract]  
Schedule of Change in Environmental Loss Contingencies [Table Text Block]
An analysis of the liabilities for dispositions and discontinued operations follows:
 
June 30,
 
December 31,
 
 
2013
 
2012
 
Balance, beginning of period
$
81,695

 
$
90,824

 
Expenditures charged to liabilities
(4,015
)
 
(9,926
)
 
Increase to liabilities
448

 
797

 
Balance, end of period
78,128

 
81,695

 
Less: Current portion
(8,686
)
 
(8,105
)
 
Non-current portion
$
69,442

 
$
73,590