CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - $ / shares |
Jun. 30, 2018 |
Dec. 31, 2017 |
---|---|---|
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] | ||
Common stock, par value (in dollars per share) | ||
Common stock, authorized shares (in shares) | 150,000,000 | 150,000,000 |
Common stock, issued shares (in shares) | 111,990,222 | 111,816,170 |
Treasury stock at cost, shares (in shares) | 17,633 | 64,463 |