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Fair Value Measurements (Fair Value of Company's Long-term Debt) (Details) - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Fair value of long-term debt estimated using quoted market prices or discounted future cash flows
Fair value of long-term debt, including current maturities		$ 1,046,063	$ 517,998	$ 445,342
Fair value in excess of carrying value	[1]	$ 11,047	$ 5,813	$ 11,629
[1] Carrying value used for this purpose excludes unamortized debt issuance costs.

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- Definition

Fair value in excess of less than carrying value.

+ References

No definition available.

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- Definition

Fair Value Of Financial Instruments.

+ References

No definition available.

+ Details

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611

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