Significant Accounting Policies (Stock Transactions - Stock Option Plans Tables) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended	12 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Significant Accounting Policies [Abstract]
Options Outstanding, shares	516,332
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	25,000
Options exercised, shares		(3,841)
Options forfeited, shares	(8,333)
Options expired, shares	(2,617)
Options Outstanding, shares	530,382		516,332
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	433,884
Weighted Average exercise Price: Options Outstanding	$ 7.06
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 6.02
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price	$ 6.56
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price	$ 8.86
Weighted Average exercise Price: Options Outstanding	$ 7.01		$ 7.06
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 7.18
Weighted Average Remaining Contractual Life (in years): Options Outstanding	4 years 9 months 18 days		5 years 4 months 24 days
Weighted Average Remaining Contractual Life (in years): Options Outstanding	4 years 9 months 18 days		5 years 4 months 24 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	3 years 10 months 24 days
Aggregate Intrinsic Value: Options Outstanding	$ 327,725
Aggregate Intrinsic Value: Options Outstanding	560,237		327,725
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 478,262

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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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.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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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.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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