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Equity (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Class of Stock [Line Items]        
Accumulated other comprehensive income (loss) $ 1,059,684 $ 1,101,330 $ 1,248,348 $ 1,301,465
Accumulated other comprehensive income (loss)        
Class of Stock [Line Items]        
Accumulated other comprehensive income (loss) (4,218) (4,851) $ (971) $ (4,276)
Unrealized gains (losses) on available-for-sale securities        
Class of Stock [Line Items]        
Accumulated other comprehensive income (loss) 149 (125)    
Unrealized gains (losses) on cash flow hedges        
Class of Stock [Line Items]        
Accumulated other comprehensive income (loss) 27 (690)    
Unrealized losses on cumulative translation adjustment        
Class of Stock [Line Items]        
Accumulated other comprehensive income (loss) $ (4,394) $ (4,036)