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Basis Of Presentation (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption adjustment long-term debt	$ 311,232	$ 291,663
Adoption adjustment	297,331	328,713	$ 276,609	$ 285,696
Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption adjustment	13,671	20,022	30,039	36,704
Additional Paid-In Capital [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption adjustment	301,449	316,192	$ 273,821	$ 271,782
Cumulative Effect, Period of Adoption, Adjustment [Member] \| Accounting Standards Update 2020-06 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption adjustment long-term debt		20,400
Adoption adjustment	(19,639)
Cumulative Effect, Period of Adoption, Adjustment [Member] \| Accounting Standards Update 2020-06 [Member] \| Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption adjustment	(3,213)	3,200
Cumulative Effect, Period of Adoption, Adjustment [Member] \| Accounting Standards Update 2020-06 [Member] \| Additional Paid-In Capital [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption adjustment	$ (16,426)	$ 16,400

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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