Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands |
Jun. 30, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Consolidated Balance Sheets [Abstract] | ||
| Allowance for doubtful accounts receivable | $ 1,871 | $ 2,584 |
| Common stock, par value per share | $ 0.01 | $ 0.01 |
| Common stock, shares authorized | 190,000,000 | 190,000,000 |
| Common stock, shares outstanding | 89,195,529 | 89,076,578 |