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Accounts Receivable and Inventories (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Accounts receivable          
Trade accounts receivable $ 278,424   $ 278,424   $ 280,526
Less: Allowance for doubtful accounts (13,183)   (13,183)   (25,649)
Trade accounts receivable, net 265,241   265,241   254,877
Other receivables 16,875   16,875   30,395
Provision for doubtful accounts related to trade accounts receivable 323 $ 414 177 $ 610  
Inventories          
Finished goods 38,207   38,207   32,586
Work-in-process 29,349   29,349   30,959
Contracts-in-process 44,335   44,335   55,786
Raw materials and purchased parts 69,975   69,975   70,755
Stores and supplies 26,377   26,377   26,881
Inventories 208,243   208,243   216,967
Inventory for Contracts          
Contract costs accumulated to date 78,922   78,922   55,786
Estimated loss provisions for contracts-in-process (34,587)   (34,587)   0
Contracts-in-process 44,335   44,335   55,786
Loss provision that exceeds accumulated contract costs 5,500   5,500    
Customer Advances and Deposits $ 84,700   $ 84,700   $ 82,700