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Stock Incentive Plans (Details 2) (Stock option awards, 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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Stock option awards
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| Shares | |||
| Outstanding at beginning of year (in shares) | 696,379 | 857,468 | 1,017,922 |
| Forfeited (in shares) | (186,249) | (161,089) | (160,454) |
| Outstanding at end of period (in shares) | 510,130 | 696,379 | 857,468 |
| Exercisable at end of period (in shares) | 510,130 | 696,379 | 857,468 |
| Weighted-Average Exercise Price | |||
| Outstanding at beginning of year (in dollars per share) | $ 17.22 | $ 17.01 | $ 16.23 |
| Forfeited (in dollars per share) | $ 19.67 | $ 16.10 | $ 12.07 |
| Outstanding at end of period (in dollars per share) | $ 16.33 | $ 17.22 | $ 17.01 |
| Exercisable at end of period (in dollars per share) | $ 16.33 | $ 17.22 | $ 17.01 |