Employee Benefit Plans (Stock Option Activity) (Details) (Employee Stock Option [Member], USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2013
Aggregate Intrinsic Value, Outstanding on December 31, 2013	$ 15,970
Aggregate Intrinsic Value, Exercisable on December 31, 2013	$ 10,624
2009 Long Term Incentive Plan [Member]
Options, Outstanding on December 31, 2012	1,192,158
Options, Granted	369,137
Options, Exercised	(108,122)
Options, Outstanding on December 31. 2013	1,453,173
Options, Exercisable on December 31, 2013	705,814
Weighted Average Exercise Price per Share, Outstanding on December 31,2012	$ 14.30
Weighted Average Exercise Price per Share, Granted	$ 27.48
Weighted Average Exercise Price per Share, Exercised	$ 12.80
Weighted Average Exercise Price per Share, Outstanding on December 31, 2013	$ 17.76
Weighted Average Remaining Contractual Terms, Exercisable on December 31, 2013	$ 13.45
Weighted Average Remaining Contractual Terms, Outstanding on December 31, 2013	7 years 9 months 18 days
Weighted Average Remaining Contractual Terms, Exercisable on December 31, 2013	6 years 10 months 24 days

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.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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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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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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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.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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