Stock-Based Compensation (Detail Textuals) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2018 USD ($) Option $ / shares shares	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued \| shares \| shares	31,215,000
Allowance for flexibility in awards for every one share \| $ / shares	$ 1.87
Maximum percentage of shares issued under comparative market performance restricted stock units awards	200.00%
Unrecognized compensation cost	$ 161,900
Weighted average period of compensation cost	2 years 9 months 18 days
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares in target award outstanding \| shares	532,385
Modified percentage in performance	200.00%
Number of shares issued at twice the performance percentage \| shares	1,064,770
Fair value of vested restricted share units	$ 73,800	$ 76,100	$ 52,300
Employee Stock Purchase Plan ("ESPP")
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum Percentage of base compensation applied towards purchase of common stock	10.00%
Maximum amount of purchase allowed for a participant	$ 25
Percentage of fair market value of exercise price	85.00%
Number of exercise price \| Option	2
Minimum percentage of discount not recognized as compensation expense	5.00%
Percentage of discount on common stock	15.00%
Percentage of option held	85.00%
Risk free interest rate	2.30%	1.20%	0.50%
Volatility Factor	0.27%	0.28%	0.37%
Expected dividend yield	0.00%	0.00%	0.00%
Compensation expense related to ESPP	$ 5,700	$ 4,800	$ 4,600
Weighted average expected life	6 months	6 months	6 months

Allowance for flexibility in awards for every one share.

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Maximum amount of purchase allowed for participant.

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Maximum percentage of base compensation applied towards purchase of common stock.

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Maximum percentage of shares issued under comparative market performance restricted stock units awards.

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Minimum percentage of discount not recognized as compensation expense.

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Modified percentage in performance.

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Number of exercise price.

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Number of shares issued at twice performance percentage.

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Percentage of discount on common stock.

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Percentage of fair market value of exercise price.

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Percentage of option held.

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Share based compensation arrangement by share based payment award target award outstanding.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested options awarded to employees as compensation.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.

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Weighted average expected volatility rate of share-based compensation awards.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of share instruments newly issued under a share-based compensation plan.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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