Rental Equipment (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
Dec. 31, 2015 |
|
| Property, Plant and Equipment [Line Items] | |||||
| Accumulated depreciation | $ (111,377) | $ (111,377) | $ (107,094) | ||
| Depreciation | 13,451 | $ 14,196 | |||
| Rental Equipment | |||||
| Property, Plant and Equipment [Line Items] | |||||
| Accumulated depreciation | (9,667) | (9,667) | $ (8,322) | ||
| Depreciation | $ 1,508 | $ 2,018 | $ 4,951 | $ 5,683 | |