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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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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

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-SubTopic 10
-Section 45
-Paragraph 24
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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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