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Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 2019
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, 2019 and 2018 are:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
Net income
$
126,540

 
$
121,677

 
$
240,521

 
$
261,515

Shares used to compute basic earnings per common share
151,863,000

 
157,542,000

 
152,587,000

 
157,488,000

Dilutive effect of stock options
3,302,000

 
4,683,000

 
3,266,000

 
5,337,000

Shares used to compute diluted earnings per common share
155,165,000

 
162,225,000

 
155,853,000

 
162,825,000

Basic earnings per common share
$
0.83

 
$
0.77

 
$
1.58

 
$
1.66

Diluted earnings per common share
$
0.82

 
$
0.75

 
$
1.54

 
$
1.61
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:
 
2019
 
2018
Net income
$
240,521

 
$
261,515

Adjustments to reconcile net income to net cash provided by operating activities:
 
 
 
Depreciation
14,753

 
14,260

Amortization
25,460

 
24,015

Equity in earnings of unconsolidated affiliate
(75,149
)
 
(81,680
)
Distributions received from unconsolidated affiliate
77,288

 
89,362

Stock-based compensation
10,102

 
10,518

Provision for losses on receivables
383

 
(90
)
Deferred income tax expense
(2,050
)
 
4,893

Net (gain) loss from investments
(1,510
)
 
549

Change in long-term income taxes payable
—

 
(1,000
)
Change in other long-term liabilities
1,129

 
1,222

Change in other assets
249

 
(4,713
)
Contract costs capitalized, net of amortization
(1,125
)
 
(2,880
)
Other
122

 
(326
)
Change in current assets and liabilities
 
 
 
(Increase) decrease in
 
 
 
Receivables from investment products
(2,538
)
 
3,280

Receivables
(20,192
)
 
(31,835
)
Other current assets
3,708

 
(5,090
)
(Decrease) increase in
 
 
 
Accounts payable
(5,426
)
 
2,251

Accrued liabilities
(47,631
)
 
(22,121
)
Deferred revenue
(449
)
 
746

Total adjustments
(22,876
)
 
1,361

Net cash provided by operating activities
$
217,645

 
$
262,876