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Basis Of Presentation (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Jan. 01, 2019
Basis Of Presentation [Abstract]
U.S. tax rate	35.00%	21.00%
Reclass due to early adoption of Accounting Standards Update 2018-02			$ 1,250,000
Cumulative change due to ASU			$ (1,201,000)		$ 0
Operating lease right of use assets				$ 58,754,000	69,869,000
Operating lease liabilities				$ 65,138,000	$ 77,270,000

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Amount of increase (decrease) in accumulated other comprehensive income (AOCI) for reclassification to retained earnings of tax effect from remeasurement of deferred tax pursuant to Tax Cuts and Jobs Act.

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