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Acquisition (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Business Combinations [Abstract]      
Payments to Acquire Businesses, Gross $ 191,500 $ 195,151  
Noncash or Part Noncash Acquisition, Value of Assets Acquired 3,681,700 3,685,708 $ 0
Noncash or Part Noncash Acquisition, Investments Acquired 3,600,000    
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed $ 3,490,200 $ 3,490,557 $ 0