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Contracts and Revenue Recognition Changes in Estimates in Long Term Contracts (Tables) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Deferred Revenue Arrangement [Line Items]    
schedule of contracts in progress and adv billings [Table Text Block]
The following represent the components of our contracts in progress and advance billings on contracts included in our consolidated balance sheets:
 
December 31,
(in thousands)
2017
2016
Included in contracts in progress:
 
 
Costs incurred less costs of revenue recognized
$
80,645

$
96,210

Revenues recognized less billings to customers
80,575

69,800

Contracts in progress
$
161,220

$
166,010

Included in advance billings on contracts:
 
 
Billings to customers less revenues recognized
$
177,953

$
199,480

Costs of revenue recognized less cost incurred
3,117

11,162

Advance billings on contracts
$
181,070

$
210,642

  
Schedule of Retainages on Contract [Table Text Block]  
The following amounts represent retainage on contracts:
 
December 31,
(in thousands)
2017
2016
Retainage expected to be collected within one year
$
14,572

$
18,843

Retainage expected to be collected after one year
6,112

4,583

Total retainage
$
20,684

$
23,426
Proceeds from Insurance Settlement, Operating Activities $ 15