The number of RSU grants made to date at the period end.

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- Definition

Represents the number of shares that will vest upon achievement of certain goals under the equity-based compensation plan.

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No definition available.

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- Definition

Period over which performance goals are required to be met in order for the awards to vest.

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No definition available.

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Share-based Compensation Arrangement by Share-based Payment Award, Maximum Multiplier

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Share-based Compensation Arrangement by Share-based Payment Award, Peer Group, Asset Threshold

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The remaining period of time in which performance goals must be met in order for the awards to vest.

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No definition available.

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- Definition

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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- Definition

Unrecognized cost of unvested share-based compensation awards.

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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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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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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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- Definition

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.

+ References

No definition available.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Stock Compensation - Stock Compensation Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Omnibus Incentive Plan
Share-based compensation
Shares reserved for issuance under Omnibus Incentive Plan	4,796,822
Restricted Stock Awards and Restricted Stock Units
Share-based compensation
Compensation expense	$ 16,549,000	$ 12,687,000	$ 8,715,000
Tax benefit recognized for stock compensation expense	$ 3,871,000	5,661,000	3,103,000
Restricted Stock Awards (RSAs)
Share-based compensation
Performance based RSAs outstanding	264,373
Unrecognized stock compensation expense	$ 18,052,000	$ 17,944,000	$ 24,925,000
Weighted-average amortization (years)	1 year 7 months 6 days	1 year 7 months 6 days	1 year 7 months 6 days
Restricted Stock Units (RSUs) \| Omnibus Incentive Plan
Share-based compensation
Restricted stock units, granted (in shares)	406,575
Award performance period for RSUs	3 years
Restricted stock units, maximum multiplier	150.00%
Remaining performance period for RSUs	1 year 7 months 6 days
Minimum \| Restricted Stock Awards (RSAs)
Share-based compensation
Share-based award vesting period	1 year
Minimum \| Restricted Stock Units (RSUs) \| Omnibus Incentive Plan
Share-based compensation
Peer group, asset threshold	$ 10,000,000,000.0
Maximum \| Restricted Stock Awards (RSAs)
Share-based compensation
Share-based award vesting period	5 years
Maximum \| Restricted Stock Units (RSUs) \| Omnibus Incentive Plan
Share-based compensation
Peer group, asset threshold	$ 50,000,000,000.0