Financial Instruments - Financial Instruments Measured and Not Measured At Fair Value On Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financial instruments measured at fair value
Deferred finance costs, net	$ 33,500	$ 44,300
Fair Value
Financial instruments measured at fair value
Long-term debt, including current portion	1,423,812	1,666,156
Non-recurring basis \| Level I
Financial instruments measured at fair value
Long-term debt, including current portion	0
Non-recurring basis \| Level II
Financial instruments measured at fair value
Long-term debt, including current portion	1,423,812	1,666,156
Non-recurring basis \| Level III
Financial instruments measured at fair value
Long-term debt, including current portion	0
Non-recurring basis \| Fair Value
Financial instruments measured at fair value
Long-term debt, including current portion	1,423,812	1,666,156
Notes \| ZIM \| Fair Value
Financial instruments measured at fair value
Notes	20,078	21,044
Notes \| ZIM \| Recurring basis \| Fair Value
Financial instruments measured at fair value
Notes	20,078	21,044
Notes \| ZIM \| Recurring basis \| Fair Value \| Level I
Financial instruments measured at fair value
Notes	0
Notes \| ZIM \| Recurring basis \| Fair Value \| Level II
Financial instruments measured at fair value
Notes	20,078	21,044
Notes \| ZIM \| Recurring basis \| Fair Value \| Level III
Financial instruments measured at fair value
Notes	0
Notes \| HMM \| Fair Value
Financial instruments measured at fair value
Notes	11,377	7,847
Notes \| HMM \| Recurring basis \| Fair Value
Financial instruments measured at fair value
Notes	11,377	7,847
Notes \| HMM \| Recurring basis \| Fair Value \| Level I
Financial instruments measured at fair value
Notes	0
Notes \| HMM \| Recurring basis \| Fair Value \| Level II
Financial instruments measured at fair value
Notes	11,377	$ 7,847
Notes \| HMM \| Recurring basis \| Fair Value \| Level III
Financial instruments measured at fair value
Notes	$ 0

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/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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- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399

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- Definition

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

Fair value portion of an agreement for an unconditional promise by the maker to pay the holder a definite sum of money at a future date.

+ References

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