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Stock Compensation (Details) (USD $) | 0 Months Ended | 3 Months Ended
--- | --- | ---
Jul. 02, 2013 | Mar. 31, 2014 | Mar. 31, 2013
Stock compensation |  |  |
Grant of options to purchase (in shares) |  | 547,492 |
Options issued in 2008 to acquire shares that vested immediately |  | 11,578 |
Number of shares |  |  |
Outstanding at the beginning of period (in shares) |  | 121,405 |
Expired (in shares) |  | (18,255) |
Outstanding at the end of period (in shares) |  | 103,150 |
Exercisable at the end of period (in shares) |  | 88,633 |
Weighted average exercise price |  |  |
Outstanding at the beginning of period (in dollars per share) |  | $ 24.14 |
Expired (in dollars per share) |  | $ 28.97 |
Outstanding at the end of period (in dollars per share) |  | $ 23.28 |
Exercisable at the end of period (in dollars per share) |  | $ 23.49 |
Weighted Average Contractual Term (in years) |  |  |
Outstanding at the end of period |  | 2 years 8 months 12 days |
Exercisable at the end of period |  | 2 years 6 months |
Aggregate Intrinsic Value |  |  |
Outstanding at the end of period |  | $ 0 |
Exercisable at the end of period |  | 0 |
Additional disclosures |  |  |
Stock dividend (as a percent) | 4.00% |  |
Stock based compensation expense |  | 6,000 | 2,000
Total unrecognized compensation expense related to non-vested stock awards |  | $ 44,000 |
Weighted average period is expected to be recognized |  | 1 year 7 months 6 days |
Minimum |  |  |
Stock compensation |  |  |
Options vest over periods |  | 4 years |
Maximum |  |  |
Stock compensation |  |  |
Options vest over periods |  | 5 years |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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