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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Earnings Per Common Share
The computation of basic and diluted earnings per common share is as follows:
 
Year Ended December 31,
 
2018
 
2017
 
2016
 
(in thousands, except per share amounts)
Computation of Basic Earnings Per Share:
 
 
 
 
 
Numerator:
 
 
 
 
 
Net income
$
216,355

 
$
122,327

 
$
106,712

Income allocated to participating securities
(1,248
)
 
(845
)
 
(747
)
Net income available to common shareholders
$
215,107

 
$
121,482

 
$
105,965

Denominator

 
 
 
 
Weighted average common shares outstanding -- basic
56,130

 
56,114

 
55,872

Basic earnings per share
$
3.83

 
$
2.16

 
$
1.90

 
 
 
 
 
 
Computation of Diluted Earnings Per Share:
 
 
 
 
 
Numerator:
 
 
 
 
 
Net income
$
216,355

 
$
122,327

 
$
106,712

Income allocated to participating securities
(1,241
)
 
(842
)
 
(744
)
Net income available to common shareholders
$
215,114

 
$
121,485

 
$
105,968

Denominator:
 
 
 
 
 
Weighted average common shares outstanding -- basic
56,130

 
56,114

 
55,872

Diluted effect of stock options and PVRSUs
471

 
412

 
283

Weighted average commons shares outstanding -- diluted
56,601

 
56,526

 
56,155

Diluted earnings per share
$
3.80

 
$
2.15

 
$
1.89