Significant Accounting Policies (table) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Significant Accounting Policies (Table) [Abstract]
Cumulative foreign currency translation	$ (118,071)	$ (114,427)
Cumulative supplemental benefit plans	(6,267)	(3,540)
Net unrecognized losses on interest rate swap	1,920	(2,699)
Net unrealized gains on marketable securities	0	550
Accumulated other comprehensive loss	$ (122,418)	$ (120,116)