Equity-Based Compensation - Summary of Status of Equity-Based Compensation Plans (Details 4)	Dec. 31, 2018 shares
Performance Option [Member]
Summary of Status of Equity-Based Compensation Plans
Stock options outstanding, shares	350,000
2018 Plan [Member]
Summary of Status of Equity-Based Compensation Plans
Awards originally available to be granted	2,500,000
Stock options outstanding, shares	25,200
Restricted Stock Units, awarded and vested	0
RSUs outstanding, shares	25,200
Awards available to be granted	2,474,800
2018 Plan [Member] \| Performance Option [Member]
Summary of Status of Equity-Based Compensation Plans
Stock options outstanding, shares	0
2014 Plan
Summary of Status of Equity-Based Compensation Plans
Awards originally available to be granted	1,500,000
Stock options outstanding, shares	997,035
Restricted Stock Units, awarded and vested	0
RSUs outstanding, shares	722,035
Awards available to be granted	0
2014 Plan \| Performance Option [Member]
Summary of Status of Equity-Based Compensation Plans
Stock options outstanding, shares	275,000
2009 Plan
Summary of Status of Equity-Based Compensation Plans
Awards originally available to be granted	3,400,000
Stock options outstanding, shares	92,600
RSUs outstanding, shares	92,600
Awards available to be granted	0
2009 Plan \| Performance Option [Member]
Summary of Status of Equity-Based Compensation Plans
Stock options outstanding, shares	0
2004 Plan
Summary of Status of Equity-Based Compensation Plans
Awards originally available to be granted	6,500,000
Stock options outstanding, shares	35,952
RSUs outstanding, shares	35,952
Awards available to be granted	0
2004 Plan \| Performance Option [Member]
Summary of Status of Equity-Based Compensation Plans
Stock options outstanding, shares	0
Directors' Plan
Summary of Status of Equity-Based Compensation Plans
Stock options outstanding, shares	5,522
RSUs outstanding, shares	5,522
Awards available to be granted	0
Directors' Plan \| Performance Option [Member]
Summary of Status of Equity-Based Compensation Plans
Stock options outstanding, shares	0

Share based compensation arrangement by share based payment award number of shares originally available.

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Share based compensation arrangement by share based payment award restricted stock units awarded or vested.

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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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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Number of options outstanding, including both vested and non-vested options.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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