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Supplemental Operating Information (Tables)
 12 Months Ended
Dec. 31, 2016
Other Nonoperating Income (Expense) [Abstract]  
Schedule of other nonoperating income (Expense) [Table Text Block]
Other nonoperating (expense) income, net, included in the statements of operations follows:

 
Year Ended December 31,
 
2016
 
2015
 
2014
Other nonoperating expense, net
$
(3,989
)
 
$
(5,744
)
 
$
(3,050
)