Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Notes (Details)

v2.4.1.9
Fair Value Measurements - Notes (Details) (Notes, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
2033 Senior Notes $ 63,062us-gaap_NotesPayableFairValueDisclosure
Level 3
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
2033 Senior Notes 63,062us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
Carrying Value [Member]
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
2033 Senior Notes $ 65,507us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember