Newly Issued Accounting Pronouncements Newly Issued Accounting Pronouncements (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Mar. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Assets		$ 3,125,018	$ 3,144,360
Liabilities and Equity		$ 3,125,018	$ 3,144,360
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2016-02 | Scenario, Forecast
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Assets	$ 6,000
Liabilities and Equity	$ 6,000