Leases and Rentals - Schedule of Capital Leases Included in Plant, Property and Equipment, Net (Details) - Machinery and equipment - USD ($) $ in Thousands |
Dec. 31, 2017 |
Dec. 31, 2016 |
|---|---|---|
| Capital Leases, Balance Sheet, Assets by Major Class, Net [Abstract] | ||
| Machinery and equipment | $ 1,625 | $ 1,625 |
| Accumulated depreciation | (1,504) | (1,409) |
| Machinery and equipment, net | $ 121 | $ 216 |