Supplemental Cash Flow Information (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Supplemental Cash Flow Elements [Abstract]
Payments of interest and commitment fees			$ 56,800	$ 46,300
Interest Paid, Capitalized			11,900	11,500
Incurred liabilities for fixed and intangible asset additions			50,200	61,200
Other Asset Additions Incurred but Not yet Paid			100
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain	$ 335,260	$ 0	$ 335,260	$ 0