Share-Based Compensation - Schedule of Share Based Compensation Stock Options Activity (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock Options, Shares:
Outstanding Beginning Shares	3,126	3,713	3,587
Granted Shares	176	186	402
Exercised Shares	(564)	(341)	(274)
Forfeited or Expired Shares	(2)	(432)	(2)
Outstanding Ending Shares	2,736	3,126	3,713
Shares Exercisable	2,205	2,509	2,715
Weighted Average Exercise Price:
Outstanding Beginning Weighted Average Exercise Price	$ 18.93	$ 17.85	$ 16.69
Granted Weighted Average Exercise Price	$ 27.92	$ 23.35	$ 19.31
Exercised Weighted Average Exercise Price	$ 10.37	$ 7.70	$ 4.81
Forfeited or Expired Weighted Average Exercise Price	$ 29.21	$ 20.34	$ 20.10
Outstanding Ending Weighted Average Exercise Price	$ 21.26	$ 18.93	$ 17.85
Exercisable Weighted Average Exercise Price	$ 20.49	$ 18.01	$ 16.48
Weighted Average Remaining Contractual Term:
Outstanding Weighted Average Remaining Contractual Term	4 years
Exercisable Weighted Average Remaining Contractual Term	3 years 3 months 18 days
Aggregate Intrinsic Value :
Outstanding Intrinsic Value	$ 17,840
Exercised Intrinsic Value	10,090
Exercisable Intrinsic Value	$ 16,036

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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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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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For presentations that combine terminations, 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 or that expired.

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Weighted average price of options that were either forfeited or expired.

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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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