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Financial Instruments - Fair Value Measurements on a Nonrecurring basis (Table) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Long-lived assets classified as held for sale - Loss $ 3,282 $ 0 $ 0
Nonrecurring basis      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Long-lived assets classified as held for sale - Loss 3,282    
Level II | Nonrecurring basis      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Long-lived assets classified as held for sale $ 29,400