Summary of Significant Accounting Policies - Inventories and Property (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
|
| Land and Other Inventories | ||
| Land and other inventories, impairment assessment | $ 653 | $ 149 |
| Land Improvements | Minimum | ||
| Property and Equipment, net | ||
| Estimated useful lives | 5 years | |
| Land Improvements | Maximum | ||
| Property and Equipment, net | ||
| Estimated useful lives | 15 years | |
| Building and Improvements | Minimum | ||
| Property and Equipment, net | ||
| Estimated useful lives | 3 years | |
| Building and Improvements | Maximum | ||
| Property and Equipment, net | ||
| Estimated useful lives | 40 years | |
| Machinery, Equipment and Fixtures | Minimum | ||
| Property and Equipment, net | ||
| Estimated useful lives | 3 years | |
| Machinery, Equipment and Fixtures | Maximum | ||
| Property and Equipment, net | ||
| Estimated useful lives | 10 years | |