Basis of Presentation and Recent Accounting Pronouncements (Details) - USD ($)	Sep. 30, 2019	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liability	$ 147,325,000
ASU 2018-11
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of an accounting change		$ 0
Other assets
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use assets	131,424,000
Other assets | ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use assets		147,900,000
Other liabilities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liability	$ 147,326,000
Other liabilities | ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liability		$ 163,600,000