Basis Of Presentation (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jul. 01, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets	$ 81,959
Lease liabilities	89,029
Stockholders' equity	1,439,048	$ 1,521,083	$ 1,470,938		$ 1,519,319	$ 1,549,792	$ 1,590,943	$ 1,685,424	$ 1,737,049
ASU 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets				$ 87,414
Lease liabilities				$ 92,982
ASU 2016-02 [Member] | Effect of Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity		0			(439)
Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity	$ 610,932	586,593	$ 587,557		695,017	$ 708,568	$ 774,405	$ 840,906	$ 878,516
Retained Earnings [Member] | ASU 2016-02 [Member] | Effect of Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity		$ 0			$ (439)