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INCOME TAXES AND RELATED PAYMENTS (Tables)
12 Months Ended
Dec. 31, 2012
Income Tax Disclosure [Abstract]  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
Income tax expense from operations consisted of the following:  
 
Year Ended December 31,
 
2012
 
2011
 
2010
Current:
 
 
 
 
 
U.S. federal income tax
$
11,232

 
$
8,869

 
$
13,665

State and local income tax
3,737

 
4,786

 
5,573

Foreign income tax
3,351

 
3,588

 
4,984

 
$
18,320

 
$
17,243

 
$
24,222

Deferred:
 
 
 

 
 

U.S. federal income tax
$
7,432

 
$
3,285

 
$
1,907

State and local income tax
5,106

 
560

 
270

 
$
12,538

 
$
3,845

 
$
2,177

Total:
 
 
 

 
 

U.S. federal income tax
$
18,664

 
$
12,154

 
$
15,572

State and local income tax
8,843

 
5,346

 
5,843

Foreign income tax
3,351

 
3,588

 
4,984

Income tax expense
$
30,858

 
$
21,088

 
$
26,399

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]
The Company’s income before income taxes consisted of the following:  
 
Year Ended December 31,
 
2012
 
2011
 
2010
Domestic income (loss) before income taxes
$
6,710,286

 
$
(264,603
)
 
$
5,289,742

Foreign income (loss) before income taxes
(7,011
)
 
(22,954
)
 
17,446

Total income (loss) before income taxes
$
6,703,275

 
$
(287,557
)
 
$
5,307,188

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
The Company’s effective income tax rate differed from the federal statutory rate for the following reasons:  
 
Year Ended December 31,
 
2012
 
2011
 
2010
Income tax expense at federal statutory rate
35.00
 %
 
35.00
 %
 
35.00
 %
Income passed through
(34.78
)
 
(19.49
)
 
(35.53
)
State and local taxes, net of federal benefit
0.07

 
(1.75
)
 
0.11

Foreign taxes
0.09

 
(4.04
)
 
(0.02
)
Equity-based compensation expense

 
(17.44
)
 
0.94

Other, net
0.08

 
0.39

 

Total effective rate
0.46
 %
 
(7.33
)%
 
0.50
 %
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
The income tax effects of temporary differences that give rise to significant portions of deferred tax assets and liabilities were as follows:
 
As of December 31,
 
2012
 
2011
 
2010
Deferred tax assets:
 

 
 

 
 

Investment in partnerships
$
157,999

 
$
67,918

 
$
72,177

Equity-based compensation expense
3,994

 
3,703

 
3,010

Other, net
1,697

 
1,365

 
1,432

Total deferred tax assets
163,690

 
72,986

 
76,619

Total deferred tax liabilities
4,519

 
4,548

 
4,336

Net deferred tax assets before valuation allowance
159,171

 
68,438

 
72,283

Valuation allowance

 

 

Net deferred tax assets
$
159,171

 
$
68,438

 
$
72,283

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]
The following is a tabular reconciliation of unrecognized tax benefits (excluding interest and penalties thereon):
 
Year Ended December 31,
 
2012
 
2011
 
2010
Unrecognized tax benefits, January 1
$
8,594

 
$
7,955

 
$
6,142

Additions for tax positions related to the current year
72

 
822

 
1,813

Additions for tax positions related to prior years
806

 

 

Reductions for tax positions related to prior years

 

 

Settlement of tax positions

 

 

Lapse of statute of limitations

 
(183
)
 

Unrecognized tax benefits, December 31
$
9,472

 
$
8,594

 
$
7,955