Summary of Significant Accounting Policies ASU Adjustment (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Non-cash (gain) loss on extinguishment of debt, non cash portion		$ (22)	$ 15,722	$ (4,123)
(Gain) loss on extinguishment of debt		35	(15,722)	16,578
Net cash provided by operating activities		515,390	552,804	990,807
Other, net		0	0	(985)
Net cash used in investing activities		(201,530)	(1,867,639)	(1,144,639)
Cash paid for extinguishment of debt		(13)	0	(12,455)
Net cash provided by financing activities		(12,289)	1,327,189	153,730
Net change in cash, cash equivalents, and restricted cash	[1]	301,571	12,354	(102)
Cash and cash equivalents at beginning of period		9,372	18
Cash, cash equivalents, and restricted cash at beginning of period	[1]	12,372	18	120
Cash and cash equivalents at end of period		313,943	9,372	18
Cash, cash equivalents, and restricted cash at end of period	[1]	313,943	12,372	18
As Reported | Accounting Standards Update 2016-15, 2016-18
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Non-cash (gain) loss on extinguishment of debt, non cash portion			15,722	(4,123)
Net cash provided by operating activities			552,804	978,352
Other, net			(3,000)	(985)
Net cash used in investing activities			(1,870,639)	(1,144,639)
Net cash provided by financing activities			1,327,189	166,185
Net change in cash and cash equivalents			9,354	(102)
Cash and cash equivalents at beginning of period		$ 9,372	18	120
Cash and cash equivalents at end of period			$ 9,372	$ 18

[1] (1) Refer to Note 1 – Summary of Significant Accounting Policies for a reconciliation of cash, cash equivalents, and restricted cash reported to the amounts reported within the accompanying balance sheets.