Acquisition (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Supplemental Cash Flow Elements [Abstract]
Payments to Acquire Businesses, Gross	$ (191,450)
Noncash or Part Noncash Acquisition, Value of Assets Acquired	3,681,699	$ 0
Noncash or Part Noncash Acquisition, Investments Acquired	3,600,000
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed	$ 3,490,249	$ 0