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Stockholders' Equity - Reconciliation of Number of Shares of Common Stock (Details) - shares	5 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2017
Stockholders Equity Note [Abstract]
Common stock, beginning of period		44,251,000	45,721,000
Shares issued for stock options exercised			38,000
Shares of common stock issued upon lapse of restricted stock units ("RSUs")		329,000	341,000
Common stock retired	(1,358,480)	(1,412,000)	(1,065,000)
Common stock, end of period	43,168,000	43,168,000	45,035,000

X

- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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