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Equity Incentive Plan (Tables)

6 Months Ended

Jun. 30, 2019

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

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

Restricted stock activity is summarized as follows:

​

​	​	​	​	​	​
​		Shares		Weighted Average
​	​	Outstanding	​	Grant Date
​	​	(in thousands)	​	Fair Value
Unvested restricted stock at December 31, 2018		212	​	$	42.74
Restricted stock granted		52	​	$	65.68
Restricted stock vested		(63)	​	$	38.96
Unvested restricted stock at June 30, 2019		201	​	$	50.31

Summary of activity of performance shares

​

​	​	​	​	​	​
​		Target Number		Weighted Average
​	​	of Awards	​	Grant Date
​	​	(in thousands)	​	Fair Value
Performance shares at December 31, 2018		31	​	$	47.73
Performance units granted		30	​	$	65.66
Performance shares and units at June 30, 2019		61	​	$	56.57

​

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- References

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- Definition

Tabular disclosure of the changes in outstanding nonvested performance-based units.

+ 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)(2)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

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

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