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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
Following is a summary of stock option activity for the three-year period ending December 31, 2016:
 
 
Options
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual Term
 
Aggregate
Intrinsic
Value
(in thousands)
Outstanding at January 1, 2014
 
 
1,147,320
 
 
$
13.21
 
 
 
  
 
 
 
  
 
Exercised
 
 
(134,273
) 
 
$
7.93
 
 
 
  
 
 
 
  
 
Forfeited
 
 
(2,838
) 
 
$
22.66
 
 
 
  
 
 
 
  
 
Expired
 
 
(1,428
) 
 
$
24.26
 
 
 
 
 
 
 
Outstanding at December 31, 2014
 
 
1,008,781
 
 
$
13.87
 
 
 
4.2 years
 
 
$
13,652
 
Exercised
 
 
(267,440
) 
 
$
7.19
 
 
 
  
 
 
 
  
 
Forfeited
 
 
(1,290
) 
 
$
23.14
 
 
 
  
 
 
 
  
 
Expired
 
 
(9,446
) 
 
$
5.92
 
 
 
 
 
 
 
Outstanding at December 31, 2015
 
 
730,605
 
 
$
16.40
 
 
 
3.6 years
 
 
$
3,722
 
Exercised
 
 
(443,283
) 
 
$
14.03
 
 
 
  
 
 
 
  
 
Forfeited
 
 
(933
) 
 
$
24.68
 
 
 
  
 
 
 
  
 
Expired
 
 
(40,672
) 
 
$
21.40
 
 
 
 
 
 
 
Outstanding and Exercisable at December 31, 2016
 
 
245,717
 
 
$
19.82
 
 
 
4.4 years
 
 
$
4,396
 
Schedule of Cash Proceeds Received from Share-based Payment Awards [Table Text Block]
Other data relating to option activity for the years ended December 31 are as follows:
 
(dollars in thousands)
 
2016
 
2015
 
2014
Intrinsic value of options exercised
 
$
7,832
 
 
$
5,857
 
 
$
2,383
 
Fair value of options vested
 
 
372
 
 
 
948
 
 
 
1,187
 
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
The following table summarizes information with respect to stock options outstanding and exercisable under the Company’s plans at December 31, 2016:
 
 
Options Outstanding and Exercisable
Exercise Price
 
Number Of
Options
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual
Term
$7.98 – $13.00
 
 
44,212
 
 
$
12.72
 
 
 
1.0 years
 
$13.01 – $20.00
 
 
88,638
 
 
$
17.41
 
 
 
4.8 years
 
$20.01 – $24.68
 
 
112,867
 
 
$
24.48
 
 
 
5.4 years
 
  
 
 
245,717
 
 
$
19.82
 
 
 
4.4 years
 
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
Following is a summary of restricted stock activity for the three-year period ending December 31, 2016:
 
 
 
Shares
 
Per Share
Weighted-
Average
Grant Date
Fair Value
Outstanding unvested at January 1, 2014
 
 
211,716
 
 
$
21.33
 
Granted
 
 
82,351
 
 
$
24.46
 
Vested
 
 
(64,657
) 
 
$
20.85
 
Forfeited
 
 
(9,073
) 
 
$
21.34
 
Outstanding unvested at December 31, 2014
 
 
220,337
 
 
$
22.64
 
Granted
 
 
83,236
 
 
$
29.21
 
Vested
 
 
(102,297
) 
 
$
22.42
 
Forfeited
 
 
(3,131
) 
 
$
24.10
 
Outstanding unvested at December 31, 2015
 
 
198,145
 
 
$
24.48
 
Granted
 
 
106,968
 
 
$
24.63
 
Vested
 
 
(87,033
) 
 
$
25.11
 
Forfeited
 
 
(3,144
) 
 
$
26.09
 
Outstanding unvested at December 31, 2016
 
 
214,936
 
 
$
25.21
 
Schedule of Share-based Compensation,Phantom Stock Activity [Table Text Block]
Following is a summary of phantom stock activity for the two-year period ending December 31, 2016:
 
 
 
Shares
 
Per Share
Weighted-
Average
Grant Date
Fair Value
Outstanding unvested at January 1, 2015
 
 
—
 
 
$
0.00
 
Granted
 
 
3,804
 
 
$
29.57
 
Outstanding unvested at December 31, 2015
 
 
3,804
 
 
$
29.57
 
Granted
 
 
5,944
 
 
$
25.23
 
Vested
 
 
(1,268
) 
 
$
29.57
 
Outstanding unvested at December 31, 2016
 
 
8,480
 
 
$
26.53
 
Schedule of Nonvested Performance-based Units Activity [Table Text Block]
Following is a summary of performance share award activity for the three-year period ending December 31, 2016:
 
 
Shares
 
Per Share
Weighted-
Average
Grant Date
Fair Value
Outstanding at January 1, 2014
 
 
87,194
 
 
$
21.29
 
Granted at target
 
 
85,078
 
 
$
27.69
 
Earned for performance above target
 
 
25,292
 
 
$
17.48
 
Vested
 
 
(65,237
) 
 
$
17.48
 
Forfeited
 
 
(5,524
) 
 
$
24.84
 
Outstanding at December 31, 2014
 
 
126,803
 
 
$
26.63
 
Granted at target
 
 
69,978
 
 
$
38.70
 
Forfeited for performance below target
 
 
(3,810
) 
 
$
24.68
 
Vested
 
 
(40,474
) 
 
$
24.68
 
Forfeited
 
 
(8,889
) 
 
$
30.87
 
Outstanding at December 31, 2015
 
 
143,608
 
 
$
32.68
 
Granted at target
 
 
79,661
 
 
$
28.25
 
Earned for performance above target
 
 
20,650
 
 
$
31.01
 
Vested
 
 
(98,270
) 
 
$
27.74
 
Forfeited
 
 
(1,626
) 
 
$
32.96
 
Outstanding at December 31, 2016
 
 
144,023
 
 
$
32.92