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Equity Incentive Program (Tables)

6 Months Ended

Jun. 30, 2018

Share-based Compensation [Abstract]

Schedule of Black-Scholes Option-Pricing Assumptions

The expense related to stock options granted in the six months ended June 30, 2018 and 2017 was estimated on the date of grant using a Black-Scholes option-pricing model based on the assumptions shown in the table below:

	Six Months Ended June 30,
	2018				2017
Risk-free interest rate	2.59%				1.73%	to	1.93%
Dividend yield	—%				—%
Expected life (years)	4.5				4.5
Volatility	41.2%				38.1%	to	38.8%
Fair value at date of grant	$4.83	to	$5.39		$6.07	to	$6.73

Schedule of SSAR and Stock Options Activity

The following table summarizes the Company's stock-settled stock appreciation right ("SSAR") and stock option activity for the six months ended June 30, 2018 (in millions, except share and per share amounts):

	SSARs											Stock Options
	Number of Shares			Weighted-Average Exercise Price				Aggregate Intrinsic Value		Weighted-Average Remaining Contractual Term (Years)		Number of Shares			Weighted-Average Exercise Price				Aggregate Intrinsic Value		Weighted-Average Remaining Contractual Term (Years)
Outstanding at December 31, 2017	850,516			$	21.54							4,901,739			$	18.36
Granted	—			—								923,283			14.28
Exercised	(30,624	)		12.26								(26,595	)		11.02
Forfeited	—			—								(47,918	)		15.91
Expired	(37,897	)		22.79								(140,839	)		21.27
Outstanding at June 30, 2018	781,995			$	21.85			$0.1		3.6		5,609,670			$	17.67			$7.5		4.6
Exercisable at June 30, 2018	781,995			$	21.85			$0.1		3.6		3,555,319			$	19.37			$4.3		3.9

Schedule of Restricted Stock Units Award Activity

The following table summarizes the Company's restricted stock unit ("RSU") balances for the six months ended June 30, 2018:

	Share units			Weighted-average grant date fair value
Unvested at December 31, 2017	2,202,576			$	16.54
Granted	1,569,435			14.14
Vested	(896,114	)		17.10
Forfeited	(193,995	)		15.37
Unvested at June 30, 2018	2,681,902			$	15.05

Share-based Compensation, Performance Shares Award Outstanding Activity [Table Text Block]

	Share units			Weighted-average grant date fair value
Unvested at December 31, 2017	176,000			$	15.32
Granted	381,967			13.78
Vested	—			—
Forfeited	—			—
Unvested at June 30, 2018	557,967			$	14.27

X

- Definition

Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

+ References

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

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Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock options and stock appreciation rights that were outstanding at the beginning and end of the year, exercisable at the end of the year, and the number of stock options and stock appreciation rights that were granted, exercised or converted, forfeited, and expired during the year.

+ References

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

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)
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Tabular disclosure of the number and weighted-average grant date fair value for outstanding performance shares.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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