CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Patient accounts receivable, allowance for doubtful accounts | $ 16,526 | $ 14,317 |
| Property and equipment, accumulated depreciation | 141,793 | 146,438 |
| Intangible assets, accumulated amortization | $ 25,386 | $ 25,374 |
| Preferred stock, par value | $ 0.001 | $ 0.001 |
| Preferred stock, shares authorized | 5,000,000 | 5,000,000 |
| Preferred stock, issued | 0 | 0 |
| Preferred stock, outstanding | 0 | 0 |
| Common Stock, par value | $ 0.001 | $ 0.001 |
| Common Stock, shares authorized | 60,000,000 | 60,000,000 |
| Common Stock, shares issued | 34,786,966 | 34,569,526 |
| Common Stock, shares outstanding | 33,607,282 | 33,594,572 |
| Treasury Stock at cost, shares | 1,179,684 | 974,954 |