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Fair Value Measurements - Narratives (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt and Capital Lease Obligations $ 16,422 $ 21,190
Defined Benefit Plan, Benefit Obligation 4,779 4,300
Assets, Fair Value Disclosure, Nonrecurring 0  
Liabilities, Fair Value Disclosure, Nonrecurring 0  
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Convertible Debt, Fair Value Disclosures 147,900 $ 143,500
Debt and Capital Lease Obligations $ 16,400