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Earnings per Share (Tables)
 9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Computation of basic and diluted earnings per common share The following table sets forth the computation of basic and diluted earnings per common share:  
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
 
(in thousands, except per share amounts)
Numerator
 
 
 
 
 
 
 
Net income
$
60,190

 
$
81,382

 
$
170,268

 
$
216,386

Denominator
 
 
 
 
 
 
 
Weighted-average shares outstanding, basic
69,370

 
69,727

 
69,363

 
70,689

Effect of dilutive stock awards
88

 
81

 
174

 
143

Adjusted weighted-average shares outstanding, diluted
69,458

 
69,808

 
69,537

 
70,832

Net income per share
 
 
 
 
 
 
 
Basic earnings per common share
$
0.87

 
$
1.17

 
$
2.45

 
$
3.06

Diluted earnings per common share
$
0.87

 
$
1.17

 
$
2.45

 
$
3.05

 
 
 
 
 
 
 
 
Anti-dilutive weighted-average shares
124


122

 
76

 
87