Statement of Cash Flows (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Accrued capital expenditures	$ 44,600,000	$ 84,100,000	$ 50,700,000	$ 56,200,000
Accounts Payable, Other				7,500,000
Facility lease obligation recognized during the period	0	10,800,000
Warrant Transactions [Member]
Accounts Payable, Other	0	0	0	59,800,000
Other Liabilities, Fair Value Disclosure	$ 0	$ 0	$ 0	$ 87,500,000