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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) (USD $)
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12 Months Ended | ||
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY | |||
| Issuance of shares of treasury stock for employee stock purchase plan | 37,836 | 22,493 | 23,640 |
| Issuance of shares of treasury stock for restricted stock unit vesting and related tax benefit | 18,618 | 111,012 | 6,804 |
| Cash dividends, common stock (in dollars per share) | $ 0.19 | $ 0.12 | $ 0.24 |
| Stock dividends, restricted stock units (in dollars per share) | $ 0.19 | $ 0.12 | $ 0.24 |