Equity Incentive Plan (Tables)

12 Months Ended

Dec. 31, 2018

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 share activity is summarized as follows (in thousands, except per share data):

	Shares	Weighted Average
	Outstanding	Grant Date
	(in thousands)	Fair Value
Unvested restricted stock at December 31, 2015	213	$	29.07
Restricted stock granted	93	$	37.67
Restricted stock vested	(72)	$	27.07
Restricted stock forfeited	(6)	$	35.58
Unvested restricted stock at December 31, 2016	228	$	33.02
Restricted stock granted	88	$	48.59
Restricted stock vested	(78)	$	30.95
Restricted stock forfeited	(11)	$	39.68
Unvested restricted stock at December 31, 2017	227	$	39.47
Restricted stock granted	57	$	48.85
Restricted stock vested	(72)	$	36.06
Restricted stock forfeited	(1)	$	48.28
Unvested restricted stock at December 31, 2018	211	$	43.15