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Share-Based Compensation Tables (Tables)
 12 Months Ended
Dec. 31, 2016
Share-based Compensation [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
The following table summarizes our option activity during the years ended December 31, 2016, 2015 and 2014:

 
Number of
Options
 
Weighted
Average
Exercise Price
(per common share)
Options outstanding at January 1, 2014
46,250

 
$
30.77

Granted
—

 
—

Exercised
(12,250
)
 
33.4

Forfeited or expired
(1,500
)
 
35.44

Options outstanding at December 31, 2014
32,500

 
29.56

Granted
—

 
—

Exercised
(8,000
)
 
30.96

Forfeited or expired
—

 
—

Options outstanding at December 31, 2015
24,500

 
29.11

Granted
—

 
—

Exercised
(20,000
)
 
28.39

Forfeited or expired
—

 
—

Options outstanding at December 31, 2016
4,500

 
$
32.27
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
The following table summarizes our restricted stock activity for the years ended December 31, 2016, 2015 and 2014:

 
Number of Shares
 
Weighted Average Grant Date Fair Value
Unvested restricted shares at January 1, 2014
631,956

 
$
41.14

      Granted
117,250

 
$
49.97

      Vested
(55,488
)
 
$
25.57

      Forfeited
(4,975
)
 
$
38.45

Unvested restricted shares at December 31, 2014
688,743

 
$
43.87

      Granted
216,800

 
$
64.32

      Vested
(85,021
)
 
$
31.89

      Forfeited
(7,262
)
 
$
45.94

Unvested restricted shares at December 31, 2015
813,260

 
$
50.59

      Granted
227,800

 
$
69.43

      Vested
(165,631
)
 
$
45.90

      Forfeited
(33,795
)
 
$
56.49

Unvested restricted shares at December 31, 2016
841,634

 
$
56.38