Basis of Presentation and Accounting Policies (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 segments	Jan. 01, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Resegmentation, number of reportable segments | segments	1
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use asset		$ 210,000
Lease liabilities		$ 210,000