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Earnings per Share Earnings per Share (Tables)
 12 Months Ended
Dec. 31, 2017
Loss per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The table below presents a reconciliation between basic and diluted weighted average shares outstanding, net income available to common shareholders and basic and diluted income per share for the years ended December 31, 2017, 2016 and 2015:
 
Year Ended December 31,
(In thousands, except per share amounts)
2017
 
2016
 
2015
NUMERATOR
 
 
 
 
 
Net income
$
72,081

 
$
56,609

 
$
51,763

Preferred stock dividends
(3,656
)
 
(4,875
)
 
(4,875
)
Excess of fair value over book value of preferred shares redeemed
(2,257
)
 
—

 
—

Net income available to common shareholders
66,168

 
51,734

 
46,888

Interest on 3.25% convertible senior subordinated notes due 2017
1,106

 
1,520

 
1,499

Interest on 3.00% convertible senior subordinated notes due 2018
2,113

 
2,050

 
2,021

Diluted income available to common shareholders
$
69,387

 
$
55,304

 
$
50,408

DENOMINATOR
 
 
 
 
 
Basic weighted average shares outstanding
25,769

 
24,666

 
24,575

Effect of dilutive securities:
 
 
 
 
 
Stock option awards
342

 
216

 
237

Deferred compensation awards
221

 
149

 
150

3.25% convertible senior subordinated notes due 2017
1,687

 
2,416

 
2,416

3.00% convertible senior subordinated notes due 2018
2,669

 
2,669

 
2,669

Diluted weighted average shares outstanding - adjusted for assumed conversions
30,688

 
30,116

 
30,047

Earnings per common share
 
 
 
 
 
Basic
$
2.57

 
$
2.10

 
$
1.91

Diluted
$
2.26

 
$
1.84

 
$
1.68

Anti-dilutive equity awards not included in the calculation of diluted earnings per common share
23

 
1,273

 
1,447