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Long-Term Debt Debt Instrument Interest Cost Recognized (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Interest cost recognized for the period relating to the:        
Contractual interest coupon rate $ 3,300 $ 1,753 $ 9,127 $ 5,259
Amortization of the discount 6,059 1,499 15,747 4,414
Total interest cost recognized $ 9,359 $ 3,252 $ 24,874 $ 9,673