Derivative Instruments - Income statement disclosures (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
---|---|---|---|---|
Sep. 30, 2014
|
Sep. 30, 2013
|
Sep. 30, 2014
|
Sep. 30, 2013
|
|
Derivative Instruments, Gain (Loss) [Line Items] | ||||
Net gain on the valuation of contingent value rights | $ 0 | $ 6,940 | $ 0 | $ 40,360 |