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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.

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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + Details
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