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Stock-Based Compensation (Details 1) - $ / shares | 12 Months Ended |
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 656,611 | 670,009 | 598,346 | 617,446
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ 10.76 | $ 12.58 | $ 16.26 | $ 10.53
Share Based Compensation Arrangement by Share Based Payment Award SAR's Outstanding Number | 42,152 | 46,572 | 46,572 | 42,152
Share Based Compensation Arrangement by Share Based Payment Award SAR's Outstanding Weighted Average Exercise Price | $ 14.14 | $ 14.06 | $ 14.06 | $ 14.14
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures | 14,820 | 183,251 | 310,028 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 7.60 | $ 2.19 | $ 5.57 |
Share Based Compensation Arrangement by Share Based Payment Award SAR's Grants in Period | 0 | 0 | 0 |
Share Based Compensation Arrangement by Share Based Payment Award SAR's Grants in Period Weighted Average Grant Date Fair Value | $ 0.00 | $ 0.00 | $ 0.00 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period | 27,019 | 25,752 | 238,365 |
Share Based Compensation Arrangement by Share Based Payment Award Option Cancelled Forfeited in Period Weighted Average Grant Date Fair Value | $ 21.88 | $ 16.76 | $ 12.69 |
Share Based Compensation Arrangement by Share Based Payment Award SAR's Forfeitures in Period | 0 | 4,420 | 0 |
Share Based Compensation Arrangement by Share Based Payment Award SAR's Cancelled Forfeited in Period Weighted Average Grant Date Fair Value | $ 0.00 | $ 13.31 | $ 0.00 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | 26,966 | 170,897 |  |
Share Based Compensation Arrangement by Share Based Payment Award Option Exercises in Period Weighted Average Grant Date Fair Value | $ 3.28 | $ 7.81 |  |
Share Based Compensation Arrangement by Share Based Payment Award SAR's Exercises in Period | 0 | 0 |  |
Share Based Compensation Arrangement by Share Based Payment Award SAR's Exercises in Period Weighted Average Grant Date Fair Value | $ 0.00 | $ 0.00 |  |

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- Definition Share based compensation arrangement by share based payment award SAR's cancelled forfeited in period weighted average grant date fair value. + References No definition available. + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to 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)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + 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)(iv)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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=96867065&loc=d3e5070-113901 + Details
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