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Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2018
Accounting Policies [Abstract] |
Calculation Of Basic And Diluted Earnings Per Share | The calculations of basic and diluted earnings per share for the three and six months ended June 30, 2018 and 2017 are:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Net income | $ | 121,677 |  |  | $ | 91,769 |  |  | $ | 261,515 |  |  | $ | 180,506 |
Shares used to compute basic earnings per common share | 157,542,000 |  |  | 158,325,000 |  |  | 157,488,000 |  |  | 158,708,000 |
Dilutive effect of stock options | 4,683,000 |  |  | 3,384,000 |  |  | 5,337,000 |  |  | 3,518,000 |
Shares used to compute diluted earnings per common share | 162,225,000 |  |  | 161,709,000 |  |  | 162,825,000 |  |  | 162,226,000 |
Basic earnings per common share | $ | 0.77 |  |  | $ | 0.58 |  |  | $ | 1.66 |  |  | $ | 1.14 |
Diluted earnings per common share | $ | 0.75 |  |  | $ | 0.57 |  |  | $ | 1.61 |  |  | $ | 1.11 |
Adjustments To Reconcile Net Income To Net Cash Provided By Operating Activities | The following table provides the details of the adjustments to reconcile net income to net cash provided by operating activities for the six months ended June 30:
| 2018 |  | 2017
Net income | $ | 261,515 |  |  | $ | 180,506 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation | 14,260 |  |  | 13,399 |
Amortization | 24,015 |  |  | 24,587 |
Equity in earnings of unconsolidated affiliate | (81,680 | ) |  | (69,880 | )
Distributions received from unconsolidated affiliate | 89,362 |  |  | 75,142 |
Stock-based compensation | 10,518 |  |  | 12,439 |
Provision for losses on receivables | (90 | ) |  | 157 |
Deferred income tax expense | 4,893 |  |  | 918 |
Net loss (gain) from investments | 549 |  |  | (391 | )
Change in long-term income taxes payable | (1,000 | ) |  | — |
Change in other long-term liabilities | 1,222 |  |  | (503 | )
Change in other assets | (4,713 | ) |  | 122 |
Other | (3,206 | ) |  | 494 |
Change in current assets and liabilities |  |  |
Decrease (increase) in |  |  |
Receivables from investment products | 3,280 |  |  | 12,713 |
Receivables | (31,835 | ) |  | (34,744 | )
Other current assets | (5,090 | ) |  | (4,378 | )
Increase (decrease) in |  |  |
Accounts payable | 2,251 |  |  | (2,329 | )
Accrued liabilities | (22,121 | ) |  | (23,324 | )
Deferred revenue | 746 |  |  | (71 | )
Total adjustments | 1,361 |  |  | 4,351 |
Net cash provided by operating activities | $ | 262,876 |  |  | $ | 184,857 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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