Share-Based Compensation - Schedule of Share Based Compensation Stock Options Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Stock Options, Shares:
Outstanding Beginning Shares	1,228	1,833	2,063
Exercised Shares	(240)	(581)	(7)
Forfeited or Expired Shares		(24)	(223)
Outstanding Ending Shares	988	1,228	1,833
Shares Exercisable	988
Weighted Average Exercise Price:
Outstanding Beginning Weighted Average Exercise Price	$ 22.85	$ 23.08	$ 23.03
Exercised Weighted Average Exercise Price	20.28	23.42	18.48
Forfeited or Expired Weighted Average Exercise Price		26.87	22.75
Outstanding Ending Weighted Average Exercise Price	23.47	$ 22.85	$ 23.08
Exercisable Weighted Average Exercise Price	$ 23.47
Weighted Average Remaining Contractual Term:
Outstanding Weighted Average Remaining Contractual Term	2 years 4 months 24 days
Exercisable Weighted Average Remaining Contractual Term	2 years 4 months 24 days
Aggregate Intrinsic Value :
Outstanding Aggregate Intrinsic Value	$ 8,693
Exercisable Aggregate Intrinsic Value	$ 8,693

Share based compensation arrangement by share based payment award options aggregate intrinsic value.

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Share based compensation arrangement by share based payment award options weighted average remaining contractual term.

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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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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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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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

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

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