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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2014
Accounting Policies [Abstract] |
Allowance for Credit Losses | Changes in the liability for credit services losses are as follows (in thousands):
| Year Ended December 31,
| 2014 |  | 2013 |  | 2012
Balance at beginning of year | $ | 580 |  |  | $ | 669 |  |  | $ | 765 |
Provision for credit losses under letters of credit | 8,080 |  |  | 9,899 |  |  | 11,222 |
Amounts paid to Independent Lender under letters of credit, net of recoveries from customers | (8,167 | ) |  | (9,988 | ) |  | (11,318 | )
Balance at end of year | $ | 493 |  |  | $ | 580 |  |  | $ | 669 |
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,
| 2014 |  | 2013 |  | 2012
Numerator: |  |  |  |  |
Income from continuing operations for calculating basic and diluted earnings per share | $ | 85,438 |  |  | $ | 84,479 |  |  | $ | 80,862 |
Loss from discontinued operations | (272 | ) |  | (633 | ) |  | (503 | )
Net income for calculating basic and diluted earnings per share | $ | 85,166 |  |  | $ | 83,846 |  |  | $ | 80,359 |
Denominator: |  |  |  |  |
Weighted-average common shares for calculating basic earnings per share | 28,671 |  |  | 29,079 |  |  | 28,912 |
Effect of dilutive securities: |  |  |  |  |
Stock options and nonvested awards | 399 |  |  | 495 |  |  | 801 |
Weighted-average common shares for calculating diluted earnings per share | 29,070 |  |  | 29,574 |  |  | 29,713 |
Basic earnings per share: |  |  |  |  |
Income from continuing operations | $ | 2.98 |  |  | $ | 2.91 |  |  | $ | 2.80 |
Loss from discontinued operations | (0.01 | ) |  | (0.02 | ) |  | (0.02 | )
Net income per basic share | $ | 2.97 |  |  | $ | 2.89 |  |  | $ | 2.78 |
Diluted earnings per share: |  |  |  |  |
Income from continuing operations | $ | 2.94 |  |  | $ | 2.86 |  |  | $ | 2.72 |
Loss from discontinued operations | (0.01 | ) |  | (0.02 | ) |  | (0.02 | )
Net income per diluted share | $ | 2.93 |  |  | $ | 2.84 |  |  | $ | 2.70 |

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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=35738203&loc=SL6953423-111524 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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