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Summary of Significant Accounting Policies Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash from operating activities	$ 434,527	$ 422,551	$ 300,339
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 273,202	227,279	210,350	$ 177,851
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect		16,929	32,499
Adjustments [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash from operating activities		7,687	(2,542)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents		24,175	16,488	19,030
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect		7,687	(2,542)
As Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash from operating activities		414,864	302,881
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents		203,104	193,862	$ 158,821
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect		$ 9,242	$ 35,041

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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.

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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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