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Summary of Significant Accounting Policies (New Accounting Pronouncements) (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Effects Allocated Directly to Equity, Cumulative Effect of Change in Accounting Principle		$ 17,700
Effective Income Tax Rate Reconciliation, Equity in Earnings (Losses) of Unconsolidated Subsidiary, Amount	$ 6,103	10,532	$ 0
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	(2,600)	(156,400)
Adjustments for New Accounting Pronouncement [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	(55,200)
Accounting Standards Update 2018 02 [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	2,020	(17,723)
AOCI Attributable to Parent [Member] | Accounting Standards Update 2018 02 [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 2,573	$ (156,372)

X

- Definition

Amount of cumulative tax effect on beginning retained earnings from change in accounting principle.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 20
-Section 45
-Paragraph 11
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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to equity in earnings (loss) of unconsolidated subsidiaries exempt from income taxes.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 740
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-Section 50
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