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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2014
Accounting Policies [Abstract]  
Financial Instruments
The following table provides the carrying amounts and approximate fair values (based on the last available trading data) of our 7.5% senior secured notes due 2021 (the "7.5% Notes due 2021") and our 7.5% senior unsecured notes due 2014 (the "7.5% Notes due 2014"). See Note 4 Fair value measurements for additional information about these financial instruments.
 
December 31, 2014
December 31, 2013
 
Carrying amount
Fair value
Carrying amount
Fair value
7.5% Notes due 2021
$
246,888

$
256,408

$
246,528

$
244,375

7.5% Notes due 2014
—

—

2,603

2,487