Acquisitions (Identifiable Intangible Assets) (Details) - USD ($) $ in Thousands |
Feb. 27, 2017 |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|---|---|
| Goodwill | ||||
| Goodwill | $ 21,867 | $ 16,809 | $ 2,760 | |
| Triad Holdings, Inc. | ||||
| Goodwill | ||||
| Goodwill | $ 4,627 | |||
| Triad Holdings, Inc. | Minimum | ||||
| Identifiable Intangible Assets | ||||
| Discount rate used | 15.00% | |||
| Triad Holdings, Inc. | Maximum | ||||
| Identifiable Intangible Assets | ||||
| Discount rate used | 16.00% | |||
| Triad Holdings, Inc. | Customer relationships | ||||
| Identifiable Intangible Assets | ||||
| Acquired intangible assets | $ 2,500 | |||
| Weighted average amortization period | 10 years | |||
| Triad Holdings, Inc. | Trademark/trade name | ||||
| Identifiable Intangible Assets | ||||
| Acquired intangible assets | $ 2,400 | |||
| Weighted average amortization period | 12 years | |||
| Triad Holdings, Inc. | Developed technology | ||||
| Identifiable Intangible Assets | ||||
| Acquired intangible assets | $ 1,400 | |||
| Weighted average amortization period | 12 years |