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Basis of Presentation and Principles of Consolidation (Reclassification) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Additional paid-in capital $ 3,632,246 $ 3,689,330    
Common stock 75 81    
Total equity $ 1,015,393 $ 1,101,330 $ 1,219,598 $ 1,248,348
As Reported        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Additional paid-in capital     4,007,540  
Common stock     146  
Treasury stock, at cost     (263,512)  
APIC_CommonStock_TreasuryStock     3,744,174  
Change        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Additional paid-in capital     (263,451)  
Common stock     (61)  
Treasury stock, at cost     263,512  
APIC_CommonStock_TreasuryStock     0  
As Adjusted        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Additional paid-in capital     3,744,089  
Common stock     85  
Treasury stock, at cost     0  
APIC_CommonStock_TreasuryStock     $ 3,744,174