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REVENUE Revenue from Contract with Customer (Policies)
 6 Months Ended
Jun. 30, 2018
Capitalized Contract Cost [Line Items]  
Contract with Customer, Asset and Liability [Table Text Block]
Contract asset activity for the six months ended June 30, 2018 was as follows (in thousands):
 
June 30, 2018
Contract asset at January 1, 2018
$
6,579

Revenue in excess of billings
14,233

Customer billings
(5,268
)
Contract asset at June 30, 2018
$
15,544

Contract Asset

Contract asset activity for the six months ended June 30, 2018 was as follows (in thousands):
 
June 30, 2018
Contract asset at January 1, 2018
$
6,579

Revenue in excess of billings
14,233

Customer billings
(5,268
)
Contract asset at June 30, 2018
$
15,544