Acquisitions (Details) - USD ($) $ in Thousands |
3 Months Ended | ||
|---|---|---|---|
Feb. 27, 2017 |
Mar. 31, 2018 |
Mar. 31, 2017 |
|
| Business Acquisition [Line Items] | |||
| Business acquisitions holdback liability | $ 1,438 | ||
| Triad Holdings, Inc. | |||
| Business Acquisition [Line Items] | |||
| Purchase price to acquire common stock | $ 9,200 | ||
| Cash acquired in acquisition | 300 | ||
| Business acquisitions holdback liability | $ 1,400 | ||
| Purchase agreement, portion of purchase price held, period from acquisition date (in months) | 18 months | ||
| Triad Holdings, Inc. | Other long-term liabilities | |||
| Business Acquisition [Line Items] | |||
| Payments to acquire businesses modified by measurement period adjustments | $ 1,100 |