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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2013
Accounting Policies [Abstract]  
Allowance for Credit Losses
Changes in the liability for credit services losses are as follows (in thousands):
 
Year Ended December 31,
 
2013
 
2012
 
2011
Balance at beginning of year
$
669

 
$
765

 
$
943

Provision for credit losses under letters of credit
9,899

 
11,222

 
10,418

Amounts paid to Independent Lender under letters of credit, net of recoveries from customers
(9,988
)
 
(11,318
)
 
(10,596
)
Balance at end of year
$
580

 
$
669

 
$
765
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,
 
2013
 
2012
 
2011
Numerator:
 
 
 
 
 
Income from continuing operations for calculating basic and diluted earnings per share
$
84,479

 
$
80,862

 
$
70,137

Income (loss) from discontinued operations
(633
)
 
(503
)
 
7,645

Net income for calculating basic and diluted earnings per share
$
83,846

 
$
80,359

 
$
77,782

 
 
 
 
 
 
Denominator:
 
 
 
 
 
Weighted-average common shares for calculating basic earnings per share
29,079

 
28,912

 
30,706

Effect of dilutive securities:
 
 
 
 
 
Stock options, warrants and nonvested awards
495

 
801

 
792

Weighted-average common shares for calculating diluted earnings per share
29,574

 
29,713

 
31,498

 
 
 
 
 
 
Basic earnings per share:
 
 
 
 
 
Income from continuing operations
$
2.91

 
$
2.80

 
$
2.29

Income (loss) from discontinued operations
(0.02
)
 
(0.02
)
 
0.24

Net income per basic share
$
2.89

 
$
2.78

 
$
2.53

 
 
 
 
 
 
Diluted earnings per share:
 
 
 
 
 
Income from continuing operations
$
2.86

 
$
2.72

 
$
2.23

Income (loss) from discontinued operations
(0.02
)
 
(0.02
)
 
0.24

Net income per diluted share
$
2.84

 
$
2.70

 
$
2.47