Lease Accounting Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) lease	Dec. 31, 2019 USD ($)	Jan. 01, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease liabilities	$ 113,574	$ 117,214
ROU assets	$ 98,896	$ 102,075
Building
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number real estate leases for office locations | lease	42
ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease liabilities			$ 124,100
ROU assets			$ 108,500
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Term of contract	5 years
Renewal term	5 years
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Term of contract	15 years
Renewal term	10 years