Income Taxes (Narratives) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement Income Taxes Details [Abstract]
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate	35.00%
Deferred Tax Assets, Valuation Allowance	$ 1,300,000	$ 161,500
Total change in valuation allowance	1,100,000
Change in valuation allowance - earnings	(1,147,619)	199,038	$ 81,923
Change in valuation allowance - equity	(1,900)
U.S. federal alternative minimum tax credits	14,100
Deferred Tax Assets Tax Credit Carryforwards General Business	500
Foreign tax credit carryforward	1,600
U.S. federal tax operating loss	494,800	213,000
U.S. federal tax net operating loss carryforward	913,400
PA state tax net operating loss carryforwards	920,700
UT state tax net operating loss carryforwards	65,600
Canadian Operating Loss	61,300	23,800
Income taxes receivable - Canada	5,200	$ 6,200
Canadian Federal and Provincial tax loss balance	$ 33,900