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Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted average grant date fair value |  | $ 5.99 |  |
Shares issued upon exercise of stock options, shares |  | 80,685 | 136,640 | 204,240
Exercises, aggregate exercise prices |  | $ 1,137 | $ 2,733 | $ 4,088
Dividends Payable |  | $ 4,000 |  |
Dividends Payable, Amount Per Share |  | $ 0.13 |  |
Common Stock, Dividends, Per Share, Declared |  | $ 0.52 | $ 0.48 | $ 0.96
Stock Issued During Period, Value, Stock Options Exercised |  | $ 500 | $ 600 | $ 700
Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 5 years |  |
Minimum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | 4 years |
Subsequent Event [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Dividends Payable, Amount Per Share | $ 0.15 |  |  |
Percentage of Increase in Annual Dividend | 15.00% |  |  |
Common Stock, Dividends, Per Share, Declared | $ 0.60 |  |  |
Dividends Payable, Date to be Paid | Apr. 15, 2016 |  |  |
Dividends Payable, Date of Record | Mar. 31, 2016 |  |  |
Chief Executive Officer [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares issued upon exercise of stock options, shares |  | 19,000 | 32,875 | 28,500
Exercises, aggregate exercise prices |  | $ 500 | $ 600 | $ 700
Shares Paid For Stock Options Exercised |  | 18,764 | 19,656 | 18,880
Shares tendered for tax withholding |  | 1,299 | 3,112 | 2,573
President [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares issued upon exercise of stock options, shares |  | 19,000 | 32,875 | 28,500
Exercises, aggregate exercise prices |  | $ 500 | $ 600 | $ 700
Shares Paid For Stock Options Exercised |  | 18,764 | 19,656 | 18,880
Equity Option [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Employee stock options, fair value of shares vested |  | $ 800 | $ 700 |
Number of shares available for grant |  | 178,045 |  |
Aggregate intrinsic value of options outstanding |  | $ 1,700 |  |
Unrecognized compensation cost related to stock options |  | $ 2,700 |  |
Term |  | 6 years |  |
Unrecognized compensation cost, recognition period |  | 5 years |  |
Weighted average grant date fair value |  | $ 5.99 | $ 7.42 | $ 9.20
Options exercisable, weighted average exercise price |  | $ 21.93 |  |
Weighted average remaining contractual life of options outstanding, options exercisable |  | 2 years 6 months 14 days |  |
Aggregate intrinsic value of exercisable options |  | $ 1,300 |  |

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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -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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