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Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	Jan. 01, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle
Impact to Retained Earnings		$ 668,126	$ 628,433	$ 593,043	$ 585,304	$ 557,630	$ 532,088	$ 515,195	$ 498,047
Lease right-of-use assets		95,815			84,073
Operating lease liability		$ 98,006			86,713
Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle
Impact to Retained Earnings					$ (515)
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13
New Accounting Pronouncements or Change in Accounting Principle
Impact to Retained Earnings	$ 500
Adjustments | ASU 2016-13
New Accounting Pronouncements or Change in Accounting Principle
Increase in allowance for doubtful accounts	700
Increase to Deferred Tax Assets	$ 200

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Amount of increase (decrease) in allowance for credit loss on accounts receivable.

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