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Stock Options And Restricted Stock Awards (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	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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Share-based Compensation Arrangement by Share-based Payment Award, Options, Non-Cash Exercises in Period

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested options awarded to employees as compensation.

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Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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The number of grants made 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).

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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