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Stock Options And Restricted Stock Awards (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock options shares granted | 285,000 | 40,000 | 121,000
Number of stock options exercised | 380,000 | 44,000 | 66,000
Excess tax benefit from exercise of stock options | $ 1,090 | $ 269 | $ 816
Restricted stock awards shares | 108,000 | 58,000 | 36,000
Restricted stock weighted average fair value per share | $ 21.14 | $ 23.32 | $ 22.75
2006 Stock Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock option vesting period | 5 years |  |
Share-based payment award, expiration period | 10 years |  |
2006 Stock Incentive Plan [Member] | Holdings [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation number of shares available for grant | 899,000 |  |
2009 Stock Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock options shares granted | 1,500,000 |  |
Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock option compensation expense | $ 600 | $ 600 | $ 500
Unrecognized compensation cost | $ 2,400 |  |
Recognization period for unrecognized compensation cost | 5 years |  |
Intrinsic value on vested stock options | $ 1,500 | 5,900 | 6,300
Intrinsic value on outstanding stock options | 1,900 | 7,000 | 8,800
Intrinsic value on exercised stock options | $ 3,900 | $ 900 | $ 1,000
Number of stock options exercised | 380,000 | 44,000 | 66,000
Number of non-cash stock options exercised |  | 26,000 |
Excess tax benefit from exercise of stock options | $ 1,100 | $ 300 | $ 800
Stock Options [Member] | Minimum [Member] | 2006 Stock Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock option vesting period | 5 years |  |
Stock Options [Member] | Maximum [Member] | 2006 Stock Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock option vesting period | 10 years |  |
Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock option compensation expense | $ 500 | $ 900 | $ 300
Restricted stock awards, vested fair value | $ 400 |  |
Restricted Stock [Member] | 2009 Stock Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation number of shares available for grant | 598,442 |  |
Unrecognized compensation cost | $ 1,600 |  |
Restricted stock awards shares | 108,000 |  |
Restricted stock weighted average fair value per share | $ 21.14 |  |

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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 S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: 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 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 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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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