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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2012
Accounting Policies [Abstract]  
Allowance for Credit Losses
Changes in the liability for credit services losses are as follows (in thousands):
 
Year Ended December 31,
 
2012
 
2011
 
2010
Balance at beginning of year
$
831

 
$
1,026

 
$
890

Provision for credit losses under letters of credit
11,947

 
11,208

 
12,192

Amounts paid to Independent Lender under letters of credit, net of recoveries from customers
(12,045
)
 
(11,403
)
 
(12,056
)
Balance at end of year
$
733

 
$
831

 
$
1,026
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,
 
2012
 
2011
 
2010
Numerator:
 
 
 
 
 
Income from continuing operations for calculating basic and diluted earnings per share
$
81,105

 
$
70,523

 
$
51,302

Income (loss) from discontinued operations
(746
)
 
7,259

 
6,356

Net income for calculating basic and diluted earnings per share
$
80,359

 
$
77,782

 
$
57,658

 
 
 
 
 
 
Denominator:
 
 
 
 
 
Weighted-average common shares for calculating basic earnings per share
28,912

 
30,706

 
30,266

Effect of dilutive securities:
 
 
 
 
 
Stock options, warrants and nonvested awards
801

 
792

 
792

Weighted-average common shares for calculating diluted earnings per share
29,713

 
31,498

 
31,058

 
 
 
 
 
 
Basic earnings per share:
 
 
 
 
 
Income from continuing operations
$
2.81

 
$
2.30

 
$
1.69

Income (loss) from discontinued operations
(0.03
)
 
0.23

 
0.21

Net income per basic share
$
2.78

 
$
2.53

 
$
1.90

 
 
 
 
 
 
Diluted earnings per share:
 
 
 
 
 
Income from continuing operations
$
2.73

 
$
2.24

 
$
1.65

Income (loss) from discontinued operations
(0.03
)
 
0.23

 
0.21

Net income per diluted share
$
2.70

 
$
2.47

 
$
1.86