Fair Value Measurements (Quantitative Information About Significant Unobservable Inputs (Level 3) Used) (Details) - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
US States and Political Subdivisions Debt Securities [Member] \| Minimum [Member] \| Discounted Cash Flows [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	6.50%	6.50%
Expected future growth rate	1.00%	1.00%
Expected future inflation rate	1.00%	1.00%
US States and Political Subdivisions Debt Securities [Member] \| Maximum [Member] \| Discounted Cash Flows [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	7.50%	7.50%
Expected future growth rate	2.00%	2.00%
Expected future inflation rate	3.00%	3.00%
Fair Value [Member] \| US States and Political Subdivisions Debt Securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investments	$ 23,910	$ 25,162
Fixed-Rate Debt [Member] \| Minimum [Member] \| Discounted Cash Flows [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	3.00%	2.40%
Fixed-Rate Debt [Member] \| Maximum [Member] \| Discounted Cash Flows [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	5.20%	5.50%
Fixed-Rate Debt [Member] \| Fair Value [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt	$ 2,132,082	$ 1,907,579
Variable Rate Debt [Member] \| Minimum [Member] \| Discounted Cash Flows [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	1.60%	1.30%
Variable Rate Debt [Member] \| Maximum [Member] \| Discounted Cash Flows [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	2.40%	3.20%
Variable Rate Debt [Member] \| Fair Value [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt	$ 265,230	$ 248,460

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13476-108611

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- Definition

Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

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- Definition

Percentage of assumed long-term growth in revenues, used as an input to measure fair value.

+ References

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- Definition

Fair value of investments in debt securities classified as held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563

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