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Construction Reserve Funds (Tables)
 12 Months Ended
Dec. 31, 2013
Construction Reserve Funds [Abstract]  
Schedule of Construction Reserve Funds [Table Text Block]
Construction reserve fund transactions for the years ended December 31 were as follows (in thousands):
 
 
2013
 
2012
 
2011
Withdrawals
 
$
(65,493
)
 
$
(122,695
)
 
$
(82,553
)
Deposits
 
131,603

 
58,350

 
18,642

 
 
$
66,110

 
$
(64,345
)
 
$
(63,911
)