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Stock-Based Compensation (Details 2) - $ / shares | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Stock options outstanding (in shares) | 143,224 | 216,859 | 298,740 | 759,683
Outstanding options, weighted-average exercise price (in dollars per share) | $ 9.13 | $ 8.80 | $ 9.97 | $ 11.36
Outstanding options, weighted-average remaining contractual life (Year) | 1 year 3 months 14 days |  |  |
Stock options exercisable (in shares) | 102,616 |  |  |
Exercisable options, weighted-average exercise price (in dollars per share) | $ 8.33 |  |  |
Range 1 [Member] |  |  |  |
Outstanding options, exercise price range, lower limit (in dollars per share) | 5.76 |  |  |
Outstanding options, exercise price range, upper limit (in dollars per share) | $ 10.72 |  |  |
Stock options outstanding (in shares) | 99,975 |  |  |
Outstanding options, weighted-average exercise price (in dollars per share) | $ 5.76 |  |  |
Outstanding options, weighted-average remaining contractual life (Year) | 1 year 6 days |  |  |
Stock options exercisable (in shares) | 65,277 |  |  |
Exercisable options, weighted-average exercise price (in dollars per share) | $ 5.76 |  |  |
Range 2 [Member] |  |  |  |
Outstanding options, exercise price range, lower limit (in dollars per share) | 10.73 |  |  |
Outstanding options, exercise price range, upper limit (in dollars per share) | $ 11.40 |  |  |
Stock options outstanding (in shares) | 35,339 |  |  |
Outstanding options, weighted-average exercise price (in dollars per share) | $ 10.84 |  |  |
Outstanding options, weighted-average remaining contractual life (Year) | 7 months 6 days |  |  |
Stock options exercisable (in shares) | 35,339 |  |  |
Exercisable options, weighted-average exercise price (in dollars per share) | $ 10.84 |  |  |
Range 3 [Member] |  |  |  |
Outstanding options, exercise price range, lower limit (in dollars per share) | 11.41 |  |  |
Outstanding options, exercise price range, upper limit (in dollars per share) | $ 24.86 |  |  |
Stock options outstanding (in shares) | 1,160 |  |  |
Outstanding options, weighted-average exercise price (in dollars per share) | $ 22.11 |  |  |
Outstanding options, weighted-average remaining contractual life (Year) | 5 years 3 months 4 days |  |  |
Range 4 [Member] |  |  |  |
Outstanding options, exercise price range, lower limit (in dollars per share) | $ 24.87 |  |  |
Outstanding options, exercise price range, upper limit (in dollars per share) | $ 49.91 |  |  |
Stock options outstanding (in shares) | 6,750 |  |  |
Outstanding options, weighted-average exercise price (in dollars per share) | $ 47.83 |  |  |
Outstanding options, weighted-average remaining contractual life (Year) | 8 years 1 month 13 days |  |  |
Stock options exercisable (in shares) | 2,000 |  |  |
Exercisable options, weighted-average exercise price (in dollars per share) | $ 47.62 |  |  |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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 (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, 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 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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