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Significant Accounting Policies (table) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Significant Accounting Policies (Table) [Abstract]    
Cumulative foreign currency translation $ (114,427) $ (77,460)
Cumulative supplemental benefit plans (3,540) (4,266)
Net unrecognized losses on interest rate swap (2,699) (2,335)
Net unrealized gains on marketable securities 550 275
Accumulated other comprehensive loss $ (120,116) $ (83,786)