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Commitments And Contingencies Capital Commitments (Tables)
 9 Months Ended
Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]  
Unrecorded Unconditional Purchase Obligations Disclosure [Table Text Block]
The Company's capital commitments as of September 30, 2017 by year of expected payment were as follows (in thousands):
 
Remainder of 2017
 
2018
 
2019
 
Total
Shipping Services
$
4,689

 
$
2,252

 
$
—

 
$
6,941

Inland River Services
1,577

 
1,137

 
529

 
3,243

 
$
6,266

 
$
3,389

 
$
529

 
$
10,184