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Summary of significant accounting policies Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2013
Accounting Policies [Abstract]  
Financial Instruments
 The following table provides the carrying amounts and approximate fair value (based on the last available trading data) of our 7.5% senior secured notes due 2021 (the “7.5% Notes due 2021”), 7.5% senior unsecured notes due 2014 (the “7.5% Notes due 2014”) and our 8.0% senior secured notes due 2014 (the “8.0% Notes”). See Note 4 Fair value measurements for additional information about these financial instruments.
 
December 31, 2013
December 31, 2012
 
Carrying amount
Fair value
Carrying amount
Fair value
7.5% Notes due 2021
$
246,528

$
244,375

$
—

$
—

7.5% Notes due 2014
2,603

2,487

2,603

2,479

8% Notes
—

—

247,979

255,706