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Employee Benefit Plans and Shareholder Rights Plan (Tables)
 12 Months Ended
Dec. 31, 2015
Employee Benefit Plans and Shareholder Rights Plan [Abstract]  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
The following is a summary of our restricted stock and restricted stock unit activity for 2015, 2014 and 2013:
 
 
Number
 
Weighted
Average
Fair Value
 
Aggregate
Intrinsic Value
Balance at December 31, 2012
1,031,572

 
$
42.27

 
 
Granted
330,705

 
62.55

 
 
Issued
(376,078
)
 
33.18

 
$
23,904,000

Forfeited
(25,909
)
 
52.72

 
 
Balance at December 31, 2013
960,290

 
52.53

 
 
Granted
299,274

 
70.63

 
 
Issued
(411,800
)
 
43.57

 
$
29,043,000

Forfeited
(33,364
)
 
62.66

 
 
Balance at December 31, 2014
814,400

 
63.30

 
 
Granted
380,991

 
52.40

 
 
Issued
(311,119
)
 
57.94

 
$
16,518,000

Forfeited
(52,981
)
 
60.45

 
 
Balance at December 31, 2015
831,291

 
$
60.49