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Uncertain Tax Positions (Tables)
12 Months Ended
Dec. 31, 2014
Income Tax Uncertainties [Abstract]  
Long Term Liability Unrecognized Tax Benefits
As of December 31, 2014, 2013, and 2012, the liability for unrecognized tax benefits, excluding interest and penalties, was $22.8 million, $25.4 million, and $35.4 million, respectively, and is recorded in the Consolidated Balance Sheets as follows (in thousands of dollars):
December 31
 
2014
 
2013
 
2012
Deferred income taxes (contra assets)
 
$
—

 
$
—

 
$
12,445

Accrued income taxes (current)
 
—

 
—


482

Accrued income taxes (long-term)
 
22,798

 
25,423

 
22,473

Total liability for unrecognized tax benefits
 
$
22,798

 
$
25,423

 
$
35,400

Summary of Income Tax Contingencies
The table below presents a reconciliation of the beginning and ending balances of the liability for unrecognized tax benefits, excluding interest and penalties, for the years ended December 31, 2014, 2013, and 2012 (in thousands of dollars):
 
2014
 
2013
 
2012
Balance at January 1
$
25,423

 
$
35,400

 
$
34,689

Increases in unrecognized tax benefits related to the current year
2,229

 
8,999

 
2,484

Increases in unrecognized tax benefits related to prior years
167

 
9

 
1,689

Decreases in unrecognized tax benefits related to prior years
(134
)
 
(16,651
)
 
(3,350
)
Decreases in unrecognized tax benefits related to settlements
(590
)
 
(555
)
 
—

Decreases in unrecognized tax benefits due to the lapse of the applicable statute of limitations
(4,297
)
 
(1,779
)
 
(112
)
Balance at December 31
$
22,798

 
$
25,423

 
$
35,400