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Commitments And Contingencies Capital Commitments (Tables)
 6 Months Ended
Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]  
Unrecorded Unconditional Purchase Obligations Disclosure [Table Text Block]
The Company's capital commitments as of June 30, 2017 by year of expected payment were as follows (in thousands):
 
Remainder of 2017
 
2018
 
2019
 
Total
Shipping Services
$
8,356

 
$
2,259

 
$
—

 
$
10,615

Inland River Services
11,780

 
926

 
463

 
13,169

 
$
20,136

 
$
3,185

 
$
463

 
$
23,784

Shipping Services’ capital commitments included one U.S.-flag chemical and petroleum articulated tug-barge and two U.S.-flag harbor tugs. Inland River Services’ capital commitments included two inland river towboats and other equipment and improvements.