Equity Incentive Plan (Tables)

3 Months Ended

Mar. 31, 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 March 31, 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 March 31, 2019	61	$	56.57