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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Schedule of Share Repurchases
Our repurchase activity is as follows:
 
2017
2016
2015
Program
Shares
Total $
$ per share
Shares
Total $
$ per share
Shares
Total $
$ per share
Open market
8,676

$
283,654

$
32.69

165,598

$
4,440,658

$
26.82

1,037,590

$
24,999,963

$
24.09

401(k)
467,580

16,336,084

34.94

540,501

14,875,850

27.52

512,754

11,557,598

22.54

Directors and employees
45,878

1,614,425

35.19

30,072

823,446

27.38

25,746

585,413

22.74

Total
522,134

$
18,234,163

$
34.92

736,171

$
20,139,954

$
27.36

1,576,090

$
37,142,974

$
23.57


 
Inception to Date
Program
Shares
Total $
$ per share
Open market
3,843,495

$
61,232,115

$
15.93

401(k)
6,550,023

82,068,805

12.53

Directors and employees
1,919,510

17,278,033

9.00

Total
12,313,028

$
160,578,953

$
13.04
Schedule of Dividends
Our recent dividends are as follows:
Declaration Date
Record Date
Payment Date
Dividend per Share
May 19, 2015
June 12, 2015
July 1, 2015
$0.11
October 29, 2015
December 2, 2015
December 23, 2015
$0.11
May 24, 2016
June 10, 2016
July 1, 2016
$0.11
November 9, 2016
December 2, 2016
December 23, 2016
$0.13
May 16, 2017
June 9, 2017
July 7, 2017
$0.13
November 7, 2017
November 30, 2017
December 21, 2017
$0.13