Commitments and Contingencies (Future Payments) (Details) $ in Thousands	12 Months Ended
Dec. 31, 2015 USD ($)
Future minimum lease payments under noncancelable operating leases
2016	$ 22,229
2017	18,774
2018	15,432
2019	12,323
2020	10,806
Thereafter	146,951
Future minimum lease payments under noncancelable operating leases, Total	226,515
Future noncancelable purchase commitments
2016	60,064
2017	60,964
2018	28,437
2019	100,048
2020	28,665
Thereafter	86,556
Future noncancelable purchase commitments, Total	$ 364,734
Credit agreement
Change of control provisions in debt covenants
Number of months considered to determine requirement of prepayment of debts	24 months
Lower Limit \| Credit agreement
Change of control provisions in debt covenants
Debt instrument covenant, minimum percentage of ownership by a person	33.00%
Lower Limit \| Debt Securities
Change of control provisions in debt covenants
Debt instrument covenant, minimum percentage of ownership by a person	50.00%

Debt Instrument Covenant Change Of Control Percentage Of Acquired Ownership By Any Person.

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- Definition

Amount of future noncancelable purchase commitments for usage of port facilities, marine consumables, services and maintenance contracts.

+ References

No definition available.

+ Details

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-- None. No documentation exists for this element. --

+ References

No definition available.

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- Definition

Future noncancelable purchase commitments due within five year of the balance sheet date for usage of port facilities, marine consumables, services and maintenance contracts.

+ References

No definition available.

+ Details

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Future noncancelable purchase commitments due within four year of the balance sheet date for usage of port facilities, marine consumables, services and maintenance contracts.

+ References

No definition available.

+ Details

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- Definition

Future noncancelable purchase commitments due within two year of the balance sheet date for usage of port facilities, marine consumables, services and maintenance contracts.

+ References

No definition available.

+ Details

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Future noncancelable purchase commitments due within three year of the balance sheet date for usage of port facilities, marine consumables, services and maintenance contracts.

+ References

No definition available.

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Future noncancelable purchase commitments due periods greater than five years of the balance sheet date for usage of port facilities, marine consumables, services and maintenance contracts.

+ References

No definition available.

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- Definition

Future noncancelable purchase commitments due within one year of the balance sheet date for usage of port facilities, marine consumables, services and maintenance contracts.

+ References

No definition available.

+ Details

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Represents the number of months which are considered to determine whether there is a requirement to prepay the debts outstanding under the majority of credit facilities of the entity.

+ References

No definition available.

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 10
-Section 55
-Paragraph 40
-Subparagraph (Note 3)
-URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717

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- References

No definition available.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 10
-Section 55
-Paragraph 40
-Subparagraph (Note 3)
-URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697

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- Definition

Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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- Definition

Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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