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Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 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 nine months ended September 30, 2018 and 2017 are:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Net income | $ | 128,319 |  |  | $ | 101,739 |  |  | $ | 389,834 |  |  | $ | 282,245 |
Shares used to compute basic earnings per common share | 156,283,000 |  |  | 157,902,000 |  |  | 157,086,000 |  |  | 158,439,000 |
Dilutive effect of stock options | 4,228,000 |  |  | 3,246,000 |  |  | 4,967,000 |  |  | 3,427,000 |
Shares used to compute diluted earnings per common share | 160,511,000 |  |  | 161,148,000 |  |  | 162,053,000 |  |  | 161,866,000 |
Basic earnings per common share | $ | 0.82 |  |  | $ | 0.64 |  |  | $ | 2.48 |  |  | $ | 1.78 |
Diluted earnings per common share | $ | 0.80 |  |  | $ | 0.63 |  |  | $ | 2.41 |  |  | $ | 1.74 |
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 nine months ended September 30:
| 2018 |  | 2017
Net income | $ | 389,834 |  |  | $ | 282,245 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation | 21,515 |  |  | 20,347 |
Amortization | 36,420 |  |  | 38,332 |
Equity in earnings of unconsolidated affiliate | (123,406 | ) |  | (109,213 | )
Distributions received from unconsolidated affiliate | 138,216 |  |  | 117,447 |
Stock-based compensation | 16,396 |  |  | 19,527 |
Provision for losses on receivables | (29 | ) |  | 176 |
Deferred income tax expense | 8,378 |  |  | 1,143 |
Net loss (gain) from investments | 460 |  |  | (1,036 | )
Change in long-term income taxes payable | (9,859 | ) |  | — |
Change in other long-term liabilities | 1,930 |  |  | 106 |
Change in other assets | (4,214 | ) |  | 79 |
Contract costs capitalized, net of amortization | (3,463 | ) |  | — |
Other | (99 | ) |  | 1,070 |
Change in current assets and liabilities |  |  |
Decrease (increase) in |  |  |
Receivables from investment products | 2,263 |  |  | 10,800 |
Receivables | (44,878 | ) |  | (43,661 | )
Other current assets | (5,955 | ) |  | (2,962 | )
Increase (decrease) in |  |  |
Accounts payable | 3,893 |  |  | (1,748 | )
Accrued liabilities | (9,717 | ) |  | (15,856 | )
Deferred revenue | 213 |  |  | (409 | )
Total adjustments | 28,064 |  |  | 34,142 |
Net cash provided by operating activities | $ | 417,898 |  |  | $ | 316,387 |

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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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