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Capital Stock and Equity Awards (Tables)
 9 Months Ended
Sep. 30, 2017
Stockholders' Equity Note [Abstract]  
Schedule of dividends
The Company declared the following dividends during the first nine months of 2017 and 2016:

Date of Declaration
 
Dividend per Common Share
 
Payable to Shareholders of Record on
 
Payment Date
 
Total Amount
 
 
 
 
 
 
 
 
 
2017
 
 
 
 
 
 
 
 
February 14, 2017
 
$
0.30

 
March 13, 2017
 
March 31, 2017
 
$
8.9
 million
May 2, 2017
 
$
0.30

 
June 12, 2017
 
June 30, 2017
 
$
8.9
 million
August 1, 2017
 
$
0.30

 
September 11, 2017
 
September 29, 2017
 
$
8.9
 million
 
 
$
0.90

 
 
 
 
 
$
26.7
 million
 
 
 
 
 
 
 
 
 
2016
 
 
 
 
 
 
 
 
February 16, 2016
 
$
0.20

 
March 14, 2016
 
March 28, 2016
 
$
5.8
 million
May 3, 2016
 
$
0.20

 
June 13, 2016
 
June 30, 2016
 
$
5.9
 million
August 3, 2016
 
$
0.20

 
September 12, 2016
 
September 30, 2016
 
$
5.9
 million
 
 
$
0.60

 
 
 
 
 
$
17.6
 million
Schedule of summary of option activity
The following table summarizes the option activity:
 
 
Nine Months Ended September 30,
 
2017
 
2016
 
Shares
 
Weighted-
Average
Exercise
Price
 
Shares
 
Weighted-
Average
Exercise
Price
Outstanding:
 

 
 

 
 

 
 

Beginning of period
2,234,699

 
$
22.84

 
2,058,085

 
$
18.11

Granted
205,244

 
$
42.24

 
706,203

 
$
32.07

Exercised
(735,587
)
 
$
18.00

 
(256,916
)
 
$
15.92

Forfeited
(62,489
)
 
$
30.80

 
(33,039
)
 
$
27.68

End of period
1,641,867

 
$
27.13

 
2,474,333

 
$
22.19

Exercisable, end of period
699,922

 
$
22.63

 
992,643

 
$
17.04
Schedule of summary of RSU activity
The following table summarizes the RSU activity:
 
Nine Months Ended September 30,
 
2017
 
2016
 
Shares
 
Weighted-
Average
Grant Date
Fair Value
 
Shares
 
Weighted-
Average
Grant Date
Fair Value
 
 
 
 
 
 

 
 

Unvested, beginning of period
196,800

 
$
24.38

 
234,922

 
$
21.00

Granted
119,312

 
$
42.19

 
60,291

 
$
32.03

Vested
(39,113
)
 
$
32.01

 
—

 
$
—

Forfeited
(22,188
)
 
$
26.06

 
—

 
$
—

Unvested, end of period
254,811

 
$
31.40

 
295,213

 
$
23.25
Schedule of summary of amount of expense and related tax benefit
Share based compensation expense is recognized on a straight line basis over the vesting period. The amount of expense and related tax benefit is summarized below:
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2017
 
2016
 
2017
 
2016
 
(in thousands)
Share based compensation expense
$
1,760

 
$
1,520

 
$
5,338

 
$
4,207

U.S. tax benefit on share based compensation expense
467

 
425

 
1,413

 
1,182