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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2012
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
A reconciliation of the statutory federal income tax rate to the effective income tax rate for the years ended December 31, 2012, 2011 and 2010 is as follows:
 
2012
 
2011
 
2010
Statutory federal income tax rate
35.0
 %
 
35.0
%
 
35.0
%
State income tax rate, net of federal income tax effect
4.8

 
5.5

 
4.0

Section 199 deductions
(7.5
)
 

 

Other, net
2.8

 
1.4

 
0.6

Effective income tax rate
35.1
 %
 
41.9
%
 
39.6
%
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
The components of income tax expense for the years ended December 31, 2012, 2011 and 2010 are as follows (in thousands):
 
2012
 
2011
 
2010
Current:
 
 
 
 
 
Federal
$
65,054

 
$
76,637

 
$
51,502

State
20,597

 
23,101

 
13,704

Total current
85,651

 
99,738

 
65,206

Deferred:
 
 
 
 
 
Federal
406

 
(48
)
 
3,470

State
(901
)
 
988

 
(3,449
)
Total deferred
(495
)
 
940

 
21

Total
$
85,156

 
$
100,678

 
$
65,227

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
At December 31, 2012 and 2011, the net deferred income tax liability approximated (in thousands):
 
2012
 
2011
Deferred tax assets
$
22,935

 
$
21,586

Deferred tax liabilities
(43,924
)
 
(43,025
)
Net deferred income tax liability
$
(20,989
)
 
$
(21,439
)
The tax effect of temporary differences giving rise to significant portions of deferred tax assets and liabilities at December 31, 2012 and 2011 are presented below (in thousands):
 
2012
 
2011
Deferred tax assets:
 
 
 
Intangibles
$
89

 
$
510

Accrued compensation and benefits
9,221

 
8,286

Property, equipment and technology, net
570

 
887

Investment in affiliates
7,933

 
8,431

Other
5,122

 
3,472

Total deferred tax assets
22,935

 
21,586

Deferred tax liabilities:
 
 
 
Property, equipment and technology, net
(36,930
)
 
(38,962
)
Investment in affiliates
(1,687
)
 
(1,596
)
Prepaid
(996
)
 
(968
)
Other
(4,311
)
 
(1,499
)
Total deferred tax liabilities
(43,924
)
 
(43,025
)
Net deferred tax liabilities
$
(20,989
)
 
$
(21,439
)
Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table Text Block]
A reconciliation of the beginning and ending uncertain tax positions, excluding interest and penalties, is as follows (in thousands):
 
2012
 
2011
 
2010
Balance as of January 1
$
12,185

 
$
3,165

 
$
2,815

Gross increases on tax positions in prior period
3,401

 
9,186

 
205

Gross decreases on tax positions in prior period
(833
)
 
(2,215
)
 
(876
)
Gross increases on tax positions in current period
4,740

 
2,768

 
1,136

Lapse of statue of limitations

 
(719
)
 
(115
)
Balance as of December 31
$
19,493

 
$
12,185

 
$
3,165