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Basis of Presentation and Principles of Consolidation (Reclassification) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Additional paid-in capital $ 3,599,335 $ 3,689,330  
Common stock $ 72 $ 81  
As Reported      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Additional paid-in capital     $ 4,007,937
Common stock     146
Treasury stock, at cost     (263,515)
Total     3,744,568
Change      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Additional paid-in capital     (263,454)
Common stock     (61)
Treasury stock, at cost     263,515
Total     0
As Adjusted      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Additional paid-in capital     3,744,483
Common stock     85
Treasury stock, at cost     0
Total     $ 3,744,568