Stockholders' Equity - Reconciliation of beginning and ending common stock outstanding (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018
Reconciliation of the beginning and ending common stock outstanding
Balance, beginning of period		125,279,000
Balance, end of period	131,368,000	131,368,000
Common Stock
Reconciliation of the beginning and ending common stock outstanding
Balance, beginning of period		125,279,455	125,131,593
Issuance of common stock		6,099,012	26,203
Nonvested share-based awards, net of withheld shares (1)		(10,269)	121,659
Balance, end of period	131,368,198	131,368,198	125,279,455
Former Executive Chairman
Reconciliation of the beginning and ending common stock outstanding
Shares withheld to pay taxes	80,490
Accelerated stock compensation expense	$ 2.9

Reconciliation of the beginning and ending common stock 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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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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No definition available.

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Number of new stock issued during the period.

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Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

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