Stockholder's Equity and Stock-Based Compensation Expense - Activity Related to Stock Options, Restricted Stock Restricted Stock Unit Awards and Stock Appreciation Rights (Details) - shares	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018
Stock Options and Stock Appreciation Rights
Ending balance (In shares)	700,759	804,936
Stock Options
Stock Options and Stock Appreciation Rights
Beginning balance (in shares)	785,890
Granted (in shares)	10,000
Exercised (in shares)	(82,900)
Cancelled/forfeited (in shares)	(12,231)
Ending balance (In shares)	700,759
Restricted Stock and Unit Awards
Restricted Stock and Unit Awards
Beginning balance (in shares)	1,044,125
Granted (in shares)	152,155
Vested (in shares)	(202,697)
Cancelled/forfeited (in shares)	(66,666)
Ending balance (in shares)	926,917	128,131
Stock Appreciation Rights
Stock Options and Stock Appreciation Rights
Beginning balance (in shares)	1,481,541
Granted (in shares)	0
Exercised (in shares)	(150,000)
Cancelled/forfeited (in shares)	(368,528)
Ending balance (In shares)	963,013	530,865

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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- Definition

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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No definition available.

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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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Gross number of share options (or share units) granted during the period.

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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Number of share options (or share units) exercised during the current period.

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