Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Details 3)

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Fair Value Measurements (Details 3) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Unsecured debt | Convertible Notes    
Carrying amounts and estimated fair values of financial instruments not recorded at fair value    
Face amount $ 172,500 $ 172,500
Carrying Value    
Carrying amounts and estimated fair values of financial instruments not recorded at fair value    
2019 Convertible Notes 147,627  
Fair Value | Level 1    
Carrying amounts and estimated fair values of financial instruments not recorded at fair value    
2019 Convertible Notes $ 169,913