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Earnings per Share Earnings per Share (Tables)
12 Months Ended
Dec. 31, 2016
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, 2016, 2015 and 2014:
 
Year Ended December 31,
(In thousands, except per share amounts)
2016
 
2015
 
2014
NUMERATOR
 
 
 
 
 
Net income
$
56,609

 
$
51,763

 
$
50,789

Preferred stock dividends
(4,875
)
 
(4,875
)
 
(4,875
)
Net income available to common shareholders
51,734

 
46,888

 
45,914

Interest on 3.25% convertible senior subordinated notes due 2017
1,520

 
1,499

 
1,504

Interest on 3.00% convertible senior subordinated notes due 2018
2,050

 
2,021

 
2,030

Diluted income available to common shareholders
$
55,304

 
$
50,408

 
$
49,448

DENOMINATOR
 
 
 
 
 
Basic weighted average shares outstanding
24,666

 
24,575

 
24,463

Effect of dilutive securities:
 
 
 
 
 
Stock option awards
216

 
237

 
222

Deferred compensation awards
149

 
150

 
142

3.25% convertible senior subordinated notes due 2017
2,416

 
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
30,116

 
30,047

 
29,912

Earnings per common share
 
 
 
 
 
Basic
$
2.10

 
$
1.91

 
$
1.88

Diluted
$
1.84

 
$
1.68

 
$
1.65

Anti-dilutive equity awards not included in the calculation of diluted earnings per common share
1,273

 
1,447

 
1,250