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Equity-Based Compensation (Summary of the range of exercise prices and the weighted average remaining contractual life of the options) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Number of Options Outstanding	739,326	845,619	917,269	951,523
Weighted Average Exercise Price outstanding	$ 14.28	$ 14.14	$ 14.08	$ 12.45
Weighted Average Contract Life Remaining	3 years 10 months 24 days
Number of Options Exercisable	623,913
Weighted Average Exercise Price	$ 13.77
Aggregated Intrinsic Value Outstanding	$ 1,767,596
Aggregate Intrinsic Value Exercisable	$ 1,754,258
Price Range One [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices - Lower Range	$ 5.63
Range of Exercise Prices -Upper Range	$ 8.45
Number of Options Outstanding	3,532
Weighted Average Exercise Price outstanding	$ 8.28
Weighted Average Contract Life Remaining	3 months 18 days
Number of Options Exercisable	3,532
Weighted Average Exercise Price	$ 8.28
Price Range Two [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices - Lower Range	8.46
Range of Exercise Prices -Upper Range	$ 11.26
Number of Options Outstanding	0
Weighted Average Exercise Price outstanding	$ 0
Number of Options Exercisable	0
Weighted Average Exercise Price	$ 0
Price Range Three [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices - Lower Range	11.27
Range of Exercise Prices -Upper Range	$ 14.08
Number of Options Outstanding	313,394
Weighted Average Exercise Price outstanding	$ 11.81
Weighted Average Contract Life Remaining	2 years 2 months 12 days
Number of Options Exercisable	313,394
Weighted Average Exercise Price	$ 11.81
Price Range Four [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices - Lower Range	14.09
Range of Exercise Prices -Upper Range	$ 16.9
Number of Options Outstanding	265,675
Weighted Average Exercise Price outstanding	$ 15.4
Weighted Average Contract Life Remaining	4 years 8 months 12 days
Number of Options Exercisable	228,625
Weighted Average Exercise Price	$ 15.29
Price Range Five [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices - Lower Range	16.91
Range of Exercise Prices -Upper Range	$ 19.71
Number of Options Outstanding	156,725
Weighted Average Exercise Price outstanding	$ 17
Weighted Average Contract Life Remaining	6 years 2 months 12 days
Number of Options Exercisable	78,362
Weighted Average Exercise Price	$ 17.44
Price Range Six [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices - Lower Range	19.72
Range of Exercise Prices -Upper Range	$ 22.53

X

- Definition

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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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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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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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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