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Summary of Significant Accounting Policies (Tables)
 9 Months Ended
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