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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure of financing receivables (examples of financing receivables include loans, trade accounts receivable and notes receivable) and activity in the allowance for credit losses account. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition Tabular disclosure of the numerators and the denominators of the basic and diluted per-share (or per-unit) computations for income from continuing operations, including the effect that has been given to preferred dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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