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Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2018
Accounting Policies [Abstract]  
Calculation Of Basic And Diluted Earnings Per Share The calculations of basic and diluted earnings per share for the three months ended March 31, 2018 and 2017 are:
 
Three Months Ended March 31,
 
2018
 
2017
Net income
$
139,838

 
$
88,737

Shares used to compute basic earnings per common share
157,434,000

 
159,091,000

Dilutive effect of stock options
5,990,000

 
3,651,000

Shares used to compute diluted earnings per common share
163,424,000

 
162,742,000

Basic earnings per common share
$
0.89

 
$
0.56

Diluted earnings per common share
$
0.86

 
$
0.55
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 three months ended March 31:
 
2018
 
2017
Net income
$
139,838

 
$
88,737

Adjustments to reconcile net income to net cash provided by operating activities:
 
 
 
Depreciation
7,122

 
6,800

Amortization
11,854

 
12,022

Equity in earnings of unconsolidated affiliate
(40,607
)
 
(33,565
)
Distributions received from unconsolidated affiliate
45,617

 
35,265

Stock-based compensation
5,195

 
6,180

Provision for losses on receivables
93

 
(5
)
Deferred income tax expense
2,083

 
877

Net gain from investments
410

 
(347
)
Change in other long-term liabilities
579

 
965

Change in other assets
290

 
(849
)
Other
(784
)
 
56

Change in current assets and liabilities
 
 
 
Decrease (increase) in
 
 
 
Receivables from investment products
1,757

 
10,308

Receivables
(25,657
)
 
(24,243
)
Other current assets
(3,564
)
 
(2,298
)
Increase (decrease) in
 
 
 
Accounts payable
3,195

 
1,406

Accrued liabilities
(43,522
)
 
(27,754
)
Deferred revenue
275

 
(543
)
Total adjustments
(35,664
)
 
(15,725
)
Net cash provided by operating activities
$
104,174

 
$
73,012