Consolidated Balance Sheets (Parenthetical) - $ / shares |
Sep. 30, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Statement of Financial Position [Abstract] | ||
| Common stock, par value | $ 0.01 | $ 0.01 |
| Common stock, shares authorized | 150,000,000 | 150,000,000 |
| Common stock, shares issued | 41,566,019 | 41,147,707 |
| Common stock, shares outstanding | 34,987,254 | 34,568,942 |
| Treasury stock, shares | 6,578,765 | 6,578,765 |