Significant Accounting and Reporting Policies (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Mar. 25, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-Use Asset	$ 72,594		$ 0	$ 0
Operating lease, liability	$ 72,758
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-Use Asset		$ 73,500
Operating lease, liability		$ 73,500