Average Share Price, Conversion Spread, Minimum Average Price Triggering Dilutive Effect

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- Definition

Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements, Per Share

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- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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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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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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- Definition

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended		9 Months Ended
	May 26, 2017	Aug. 13, 2013	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Debt Instrument [Line Items]
Net income			$ 9,927	$ 15,555	$ 50,621	$ 75,395
Weighted Average Common Shares, Basic EPS			45,302,000	45,168,000	45,272,000	45,838,000
Weighted Average Common Shares, Dilutive effect of nonvested share awards			138,000	118,000	148,000	153,000
Weighted Average Common Shares, Diluted EPS			45,440,000	45,286,000	45,420,000	45,991,000
EPS, Basic (in dollars per share)			$ 0.22	$ 0.34	$ 1.12	$ 1.64
EPS, Dilutive effect of nonvested share awards (in dollars per share)			(0.00)	(0.00)	(0.01)	(0.00)
EPS, Diluted (in dollars per share)			$ 0.22	$ 0.34	$ 1.11	$ 1.64
Antidilutive options outstanding			0	0	0	0
Note Due 2020 \| Convertible Senior Notes
Debt Instrument [Line Items]
Minimum average share price triggering dilutive effect (usd per share)		$ 65.72
Note Due 2023 \| Convertible Senior Notes
Debt Instrument [Line Items]
Minimum average share price triggering dilutive effect (usd per share)	$ 46.24