Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Debt) (Details)

v3.3.0.814
Fair Value Measurements (Debt) (Details) - Convertible Notes - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Carrying amounts and estimated fair values    
Face amount $ 172,500 $ 172,500
Carrying Value | Level 1    
Carrying amounts and estimated fair values    
2019 Convertible Notes 148,877  
Fair Value | Level 1    
Carrying amounts and estimated fair values    
2019 Convertible Notes $ 152,663