Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands |
Mar. 31, 2020 |
Dec. 31, 2019 |
|---|---|---|
| Current assets: | ||
| Accounts Receivable, Allowance for Credit Loss, Current | $ 4,529 | $ 4,255 |
| Noncurrent assets: | ||
| Property and equipment, accumulated depreciation | 136,820 | 130,320 |
| Customer relationships and other intangible assets, accumulated amortization | $ 84,474 | $ 81,656 |
| Stockholders' equity: | ||
| Common stock, par value (in usd per share) | $ 0.0001 | $ 0.0001 |
| Common stock, shares authorized (in shares) | 100,000,000 | 100,000,000 |
| Common stock, shares issued (in shares) | 31,703,669 | 31,507,247 |
| Common stock, shares outstanding (in shares) | 25,936,569 | 26,229,809 |
| Treasury stock, shares (in shares) | 5,767,100 | 5,277,438 |