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Income Tax (Tables)
 6 Months Ended
Jun. 30, 2014
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation
For the year ended December 31, 2013 and the six months ended June 30, 2014, our non-qualifying income did not exceed the statutory limit.
 
Three Months Ended
 
Six Months Ended
 
June 30, 2013
 
June 30, 2014
 
June 30, 2013
 
June 30, 2014
 
(in thousands)
 
Tax rate %
 
(in thousands)
 
Tax rate %
 
(in thousands)
 
Tax rate %
 
(in thousands)
 
Tax rate %
Tax at statutory federal rate
$
3,418

 
35.0
 %
 
$
3,400

 
35.0
 %
 
$
6,321

 
35.0
 %
 
$
6,949

 
35.0
 %
Partnership earnings not subject to tax
(3,406
)
 
(34.8
)%
 
(3,385
)
 
(34.8
)%
 
(6,309
)
 
(34.9
)%
 
(6,995
)
 
(35.2
)%
State and local tax, net of federal benefit
72

 
0.7
 %
 
105

 
1.0
 %
 
141

 
0.8
 %
 
173

 
0.8
 %
Net income tax expense
$
84

 
0.9
 %
 
$
120

 
1.2
 %
 
$
153

 
0.9
 %
 
$
127

 
0.6
 %