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Stock-based Compensation Expense Restricted and Performance Stock Unit activity (Tables)

12 Months Ended

Dec. 31, 2018

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures [Abstract]

Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]

RSU activity is summarized in the following table:

	Units			Weighted Average Grant Date Fair Value
Outstanding as of December 31, 2015	442,993			$	32.84
Granted	193,734			35.89
Forfeited	(3,044	)		28.62
Vested	(174,891	)		31.47
Outstanding as of December 31, 2016	458,792			34.68
Granted	202,145			41.96
Forfeited	(64,840	)		39.57
Vested	(196,721	)		31.78
Outstanding as of December 31, 2017	399,376			37.98
Granted	198,864			37.99
Forfeited	(8,556	)		39.73
Vested	(160,771	)		36.77
Outstanding as of December 31, 2018	428,913			38.43

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

The fair value of stock-based compensation related to the TSR component of performance-based RSUs was determined using the Monte Carlo model and the following weighted average assumptions:

	2018						2017						2016
Risk-free interest rate				2.4	%					1.5	%					0.9	%
Expected dividend yield				—	%					—	%					—	%
Expected term (in years)				3.0						3.0						3.0
Volatility	14.7	%	-	21.8	%		15.6	%	-	22.9	%		14.5	%	-	25.9	%

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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