Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands |
Jun. 30, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Consolidated Balance Sheets [Abstract] | ||
| Allowance for doubtful accounts receivable | $ 1,225 | $ 1,407 |
| Common stock, par value per share | $ 0.01 | $ 0.01 |
| Common stock, shares authorized | 190,000,000 | 190,000,000 |
| Common stock, shares outstanding | 89,650,590 | 89,583,950 |