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Summary of Significant Accounting Policies Cash Flows (Details) - USD ($) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Net cash from operating activities | $ 217,991 | $ 200,386 |  |
Net change in cash, cash equivalents and restricted cash | 431,641 | (25,747) |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | $ 658,920 | 184,603 | $ 227,279 | $ 210,350
As Previously Reported [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Net cash from operating activities |  | 195,234 |  |
Net change in cash, cash equivalents and restricted cash |  | (30,899) |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents |  | 162,963 |  | 193,862
Adjustments [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Net cash from operating activities |  | 5,152 |  |
Net change in cash, cash equivalents and restricted cash |  | 5,152 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents |  | $ 21,640 |  | $ 16,488

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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 + Details
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