Quarterly report pursuant to Section 13 or 15(d)

Debt - Fair Value Of Embedded Derivatives (Details)

v3.7.0.1
Debt - Fair Value Of Embedded Derivatives (Details) - Notes - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Fair value of 2033 Senior Notes:    
With the embedded derivatives $ 41,329  
Without the embedded derivatives 29,538  
Estimated fair value of the embedded derivatives $ 11,791 $ 16,736