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Share-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2018

Share-Based Compensation [Abstract]

Schedule of the Allocation of Performance Shares Between Total Shareholder Return and Earnings per Share

		2018		2017		2016
Total shareholder return		55	%	55	%	55	%
Earnings per share		45	%	45	%	45	%

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award

A summary of the status of the Company’s non-vested share units as of December 31, 2018 and the changes during the year then ended, are presented below:

										Performance-based
					Time-based awards					awards
				Weighted-					Weighted-
		Common		average grant			Common		average grant
		Shares		date fair value			Shares		date fair value
Non-vested as of December 31, 2017		443,152		$	15.01		744,188		$	14.92
Granted		176,116		$	24.69		215,490		$	29.41
Vested		(182,451)		$	13.21		(284,462)		$	11.19
Forfeited or cancelled		(16,821)		$	19.99		(46,996)		$	17.13
Non-vested as of December 31, 2018		419,996		$	19.64		628,220		$	21.41

A summary of the status of the Company’s non-vested share units as of December 31, 2017 and the changes during the year then ended, are presented below:

				Time-based awards Weighted-					Performance-based awards Weighted-
		Common		average grant			Common		average grant
		Shares		date fair value			Shares		date fair value
Non-vested as of December 31, 2016		612,037		$	12.32		825,140		$	12.14
Granted		177,664		$	18.73		217,495		$	21.54
Vested		(310,207)		$	12.05		(165,783)		$	11.72
Forfeited or cancelled		(36,342)		$	13.23		(132,664)		$	12.52
Non-vested as of December 31, 2017		443,152		$	15.01		744,188		$	14.92

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- Definition

Schedule of the Allocation of Performance Shares Between Total Shareholder Return and Earnings per Share [Table Text Block]

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- Definition

Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901

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