Inventories (Narrative) (Details) - USD ($) $ in Thousands |
Sep. 30, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Inventory Disclosure [Abstract] | ||
| Percentage of LIFO inventory | 49.00% | 45.00% |
| Excess of current costs over stated LIFO value | $ 8,712 | $ 8,712 |
| Inventory obsolescence reserves | $ 7,703 | $ 9,675 |