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REVENUE Revenue from Contract with Customer (Policies)
 3 Months Ended
Mar. 31, 2018
Capitalized Contract Cost [Line Items]  
Contract with Customer, Asset and Liability [Table Text Block]
Contract asset activity for the three months ended March 31, 2018 was as follows (in thousands):
 
March 31, 2018
Contract asset at January 1, 2018
$
6,579

Revenue in excess of billings
7,281

Customer billings
(2,104
)
Contract asset at March 31, 2018
$
11,756

Contract Asset
Contract asset activity for the three months ended March 31, 2018 was as follows (in thousands):
 
March 31, 2018
Contract asset at January 1, 2018
$
6,579

Revenue in excess of billings
7,281

Customer billings
(2,104
)
Contract asset at March 31, 2018
$
11,756