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Immaterial Restatement (Tables)
12 Months Ended
Dec. 31, 2012
Immaterial Restatement [Abstract]  
Schedule of Quantifying Prior Year Misstatements Corrected in Financial Statements [Table Text Block]
The tables below detail the effects of such depreciation adjustments (including the related deferred income tax impact) on previously presented historical financial statement amounts:

Balance Sheets
 
 
12/31/2011
Accumulated depreciation
 
As originally filed
$
(1,044,589
)
Correction
(18,599
)
As restated
$
(1,063,188
)
Total assets
 
As originally filed
$
2,074,557

Correction
(18,599
)
As restated
$
2,055,958

Deferred Tax Liability
 
As originally filed
$
135,446

Correction
(1,679
)
As restated
$
133,767

Limited Partners' Equity
 
As originally filed
$
182,438

Correction
(16,920
)
As restated
$
165,518



Statements of Operations and Comprehensive Income
For the years ended December 31,
 
2011
 
2010
 
 
 
 
 
Depreciation and amortization
 
 
 
 
As originally filed
 
$
123,805

 
$
126,796

Correction
 
2,032

 
2,060

As restated
 
$
125,837

 
$
128,856

Income (loss) before tax
 
 
 
 
As originally filed
 
$
83,995

 
$
(28,322
)
Correction
 
(2,032
)
 
(2,060
)
As restated
 
$
81,963

 
$
(30,382
)
Provision (benefit) for taxes
 
 
As originally filed
 
$
11,837

 
$
3,245

Correction
 
(620
)
 
(575
)
As restated
 
$
11,217

 
$
2,670

Net income (loss)
 
 
As originally filed
 
$
72,158

 
$
(31,567
)
Correction
 
(1,412
)
 
(1,485
)
As restated
 
$
70,746

 
$
(33,052
)
 
 
 
 
 
Basic earnings per limited partner unit:
 
 
As originally filed
 
$
1.30

 
$
(0.57
)
Correction
 
(0.02
)
 
(0.03
)
As restated
 
$
1.28

 
$
(0.60
)
 
 
 
 
 
Diluted earnings per limited partner unit:
 
 
As originally filed
 
$
1.29

 
$
(0.57
)
Correction
 
(0.02
)
 
(0.03
)
As restated
 
$
1.27

 
$
(0.60
)