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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2015
Accounting Policies [Abstract]  
Allowance for Credit Losses
Changes in the liability for credit services losses are as follows (in thousands):
 
Year Ended December 31,
 
2015
 
2014
 
2013
Balance at beginning of year
$
493

 
$
580

 
$
669

Provision for credit losses under letters of credit
6,351

 
8,080

 
9,899

Amounts paid to Independent Lender under letters of credit, net of recoveries from customers
(6,346
)
 
(8,167
)
 
(9,988
)
Balance at end of year
$
498

 
$
493

 
$
580
Schedule of Calculation of Numerator and Denominator in EPS
The following table sets forth the computation of basic and diluted earnings per share (in thousands, except per share data):
 
Year Ended December 31,
 
2015
 
2014
 
2013
Numerator:
 
 
 
 
 
Income from continuing operations for calculating basic and diluted earnings per share
$
60,710

 
$
85,438

 
$
84,479

Loss from discontinued operations
—

 
(272
)
 
(633
)
Net income for calculating basic and diluted earnings per share
$
60,710

 
$
85,166

 
$
83,846

 
 
 
 
 
 
Denominator:
 
 
 
 
 
Weighted-average common shares for calculating basic earnings per share
28,138

 
28,671

 
29,079

Effect of dilutive securities:
 
 
 
 
 
Stock options and nonvested awards
188

 
399

 
495

Weighted-average common shares for calculating diluted earnings per share
28,326

 
29,070

 
29,574

 
 
 
 
 
 
Basic earnings per share:
 
 
 
 
 
Income from continuing operations
$
2.16

 
$
2.98

 
$
2.91

Loss from discontinued operations
—

 
(0.01
)
 
(0.02
)
Net income per basic share
$
2.16

 
$
2.97

 
$
2.89

 
 
 
 
 
 
Diluted earnings per share:
 
 
 
 
 
Income from continuing operations
$
2.14

 
$
2.94

 
$
2.86

Loss from discontinued operations
—

 
(0.01
)
 
(0.02
)
Net income per diluted share
$
2.14

 
$
2.93

 
$
2.84