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Summary of Significant Accounting Policies (Tables)
 6 Months Ended
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