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Fair Value Measurements (Fair Value of Company's Long-term Debt) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018
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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 |  | $ 1,078,185 | $ 517,998 | $ 444,821
Fair value in excess of carrying value | [1] | $ 4,495 | $ 5,813 | $ (8,063)
[1] | Carrying value used for this purpose excludes unamortized debt issuance costs.

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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 + Details
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