Summary Of Significant Accounting Policies (Accounting Changes To Consolidated Statements Of Cash Flows) (Details) - USD ($) $ in Thousands	3 Months Ended										12 Months Ended
	Dec. 31, 2019	[1]	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	[1]	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)	$ (27,458)		$ 801	$ 2,294	$ (2,140)	$ 4,926		$ 1,177	$ 5,028	$ 3,035	$ (26,503)	$ 14,166	$ 30,876
Change in net deferred tax assets											23,115	(1,841)	4,030
Prepaid and other assets											(216)	(2,761)	350
Accounts payable and accrued expenses											508	2,562	(3,417)
Net cash provided by operating activities											$ 24,607	32,645	23,851
As Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)	$ (27,458)		852	2,357	(2,097)	5,006		1,259	5,129	3,104
Adjustments [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)			$ (51)	$ (63)	$ (43)	$ (80)		$ (82)	$ (101)	$ (69)
Tax Year 2019 [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)												14,166	30,876
Change in net deferred tax assets												(1,841)	4,030
Accounts payable and accrued expenses												2,562	(3,417)
Net cash provided by operating activities												32,645	23,851
Tax Year 2019 [Member] | As Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)												14,498	31,112
Change in net deferred tax assets												(1,719)	4,117
Accounts payable and accrued expenses												2,107	(3,740)
Net cash provided by operating activities												32,645	23,851
Tax Year 2019 [Member] | Adjustments [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)												(332)	(236)
Change in net deferred tax assets												(122)	(87)
Accounts payable and accrued expenses												$ 455	$ 323

[1] Since previously published financial statements have been corrected, there is no impact on the fourth quarter results for 2019 and so no data is displayed here.