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Summary of Significant Accounting Policies (Recently Adopted Accounting Standards) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of a accounting change	$ 296,634	$ 289,904	$ 283,266	$ 244,072
Right of use assets	18,944	22,027
Lease liabilities	$ 19,705	22,527
ASU 2019-12 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of a accounting change		$ 13,750

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Present value of lessee's discounted obligation for lease payments from operating lease.

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