Summary of Significant Accounting Policies (Recently Adopted Accounting Standards) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets, net	$ 57,141	$ 51,342
Operating lease liabilities	$ 64,416	$ 58,005
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201602Member