XML 92 R74.htm IDEA: XBRL DOCUMENT v3.10.0.1
Inventory (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Composition of Inventory net of reserves      
Parts and supplies $ 65,645   $ 72,528
Work in progress 10,688   18,163
Inventory $ 76,333 $ 83,774 $ 90,691