Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Notes (Details)

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Fair Value Measurements - Notes (Details) - Notes - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
2033 Senior Notes $ 24,647 $ 63,062
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
2033 Senior Notes 24,647 63,062
Carrying Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
2033 Senior Notes $ 25,675 $ 65,507