CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Statement Of Financial Position [Abstract] | ||
| Preferred stock, par value | ||
| Preferred stock, shares authorized | 5,000,000 | 5,000,000 |
| Preferred stock, shares issued | ||
| Common stock, par value | $ 0.125 | $ 0.125 |
| Common stock, shares authorized | 150,000,000 | 150,000,000 |
| Common stock, shares issued | 48,692,000 | 48,674,000 |
| Common stock, shares outstanding | 48,692,000 | 48,674,000 |