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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of noncash expense for share-based payment arrangement.

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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 estimated amount of dividends to be paid to holders of the underlying shares (expected dividends) over the option's term. Dividends are taken into account because payment of dividends to shareholders reduces the fair value of the underlying shares, and option holders generally do not receive dividends.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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.

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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 or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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

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No definition available.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Share-Based Compensation (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share-Based Compensation [Line Items]
Number of shares available for grant	1,368,243		1,368,243
Share-based compensation expense	$ 4,300,000	$ 5,700,000	$ 14,331,000	$ 17,779,000
Unamortized share-based compensation expense	$ 22,800,000		$ 22,800,000
Weighted average period over which unrecognized compensation cost is expected to be recognized			2 years 1 month 6 days
Restricted Stock Units [Member]
Share-Based Compensation [Line Items]
Units granted			400,000	614,000
Weighted-average per share prices			$ 20.90	$ 25.19
Stock Options [Member]
Share-Based Compensation [Line Items]
Stock options awarded			135,000	579,000
Weighted-average exercise prices			$ 20.94	$ 23.99
Stock options expired			839,711
Weighted-average exercise prices, expired			$ 20.78
Weighted average grant date fair value			$ 6.84	$ 11.45
Expected life			5 years 9 months 18 days
Expected volatility			38.17%
Risk-free rate			2.31%
Quarterly dividends			$ 0
Unrestricted Stock Units [Member]
Share-Based Compensation [Line Items]
Units granted			98,591	115,420
Weighted-average per share prices			$ 15.72	$ 21.26