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Note 6 - Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Property, plant and equipment, gross $ 2,192,671 $ 2,172,830
Less: Accumulated depreciation (1,372,662) (1,340,938)
Property, plant and equipment, net 820,009 831,892
Other Capitalized Property Plant and Equipment [Member]    
Property, plant and equipment, gross 1,347,100 1,329,451
Equipment [Member]    
Property, plant and equipment, gross 200,859 200,175
Furniture and Fixtures [Member]    
Property, plant and equipment, gross 382,017 378,968
Building and Leasehold Improvements[Member]    
Property, plant and equipment, gross 95,985 95,314
Software and Software Development Costs [Member]    
Property, plant and equipment, gross 94,852 89,773
Construction in Progress [Member]    
Property, plant and equipment, gross 60,293 67,564
Land [Member]    
Property, plant and equipment, gross $ 11,565 $ 11,585