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Share-Based Compensation Plans Restricted Shares (Details) (Restricted shares [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified |
3 Months Ended |
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Mar. 31, 2015
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Restricted shares [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Number of shares nonvested beginning balance | 660 |
| Weighted average grant-date fair value nonvested beginning balance (in dollars per share) | $ 4.58 |
| Number of shares awards granted | 8 |
| Weighted average grant-date fair value awards granted (in dollars per share) | $ 9.85 |
| Number of shares awards vested | (89) |
| Weighted average grant-date fair value awards vested (in dollars per share) | $ 5.27 |
| Number of shares awards forfeited | (17) |
| Weighted average grant-date fair value awards forfeited (in dollars per share) | $ 4.46 |
| Number of shares nonvested ending balance | 562 |
| Weighted average grant-date fair value nonvested ending balance (in dollars per share) | $ 4.55 |