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Fair Value Measurements and Derivative Instruments (Nonrecurring) (Details) - Fair Value, Measurements, Nonrecurring - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Level 1 |  |
Assets: |  |
Cash and cash equivalents | $ 287,852,000 | $ 120,112,000
Total Assets | 287,852,000 | 120,112,000
Liabilities: |  |
Long-term debt (including current portion of long-term debt) | 0 | 0
Total Liabilities | 0 | 0
Level 2 |  |
Assets: |  |
Cash and cash equivalents | 0 | 0
Total Assets | 0 | 0
Liabilities: |  |
Long-term debt (including current portion of long-term debt) | 10,244,214,000 | 8,038,092,000
Total Liabilities | 10,244,214,000 | 8,038,092,000
Level 3 |  |
Assets: |  |
Cash and cash equivalents | 0 | 0
Total Assets | 0 | 0
Liabilities: |  |
Long-term debt (including current portion of long-term debt) | 0 | 0
Total Liabilities | 0 | 0
Total Carrying Amount |  |
Assets: |  |
Cash and cash equivalents | 287,852,000 | 120,112,000
Total Assets | 287,852,000 | 120,112,000
Liabilities: |  |
Long-term debt (including current portion of long-term debt) | 9,871,267,000 | 7,506,312,000
Total Liabilities | 9,871,267,000 | 7,506,312,000
Equity-method investment - SkySea Holding | 0 |
Total Fair Value |  |
Assets: |  |
Cash and cash equivalents | 287,852,000 | 120,112,000
Total Assets | 287,852,000 | 120,112,000
Liabilities: |  |
Long-term debt (including current portion of long-term debt) | 10,244,214,000 | 8,038,092,000
Total Liabilities | $ 10,244,214,000 | $ 8,038,092,000

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + 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=109250915&loc=d3e13433-108611 + Details
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- Definition Fair value portion of investments accounted under the equity method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66022186&loc=d3e32014-111567 + Details
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