Costs Associated With Restructuring Activities - Narrative (Details) - USD ($) |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2017 |
Sep. 30, 2016 |
Sep. 30, 2017 |
Sep. 30, 2016 |
|
| Restructuring and Related Activities [Abstract] | ||||
| Restructuring charges | $ 0 | $ 3,264,000 | $ 0 | $ 5,726,000 |