Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Notes (Details)

v3.6.0.2
Fair Value Measurements - Notes (Details) - Notes - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
2033 Senior Notes $ 28,468 $ 24,647
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
2033 Senior Notes 28,468 24,647
Carrying Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
2033 Senior Notes $ 27,238 $ 25,676