Share Based Payments - Equity Incentive Plan - October 11, 2006 - Details of Non-vested Share Awards (Table) (Details) - $ / shares	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total shares granted	2,632
Grand date fair value	$ 64.6
Shares cancelled	698
Non-vested share awards	3,923	9,172
Equity incentive plan - October 11, 2006
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total shares granted	6,843
Shares cancelled	196
Shares vested	6,647
Non-vested share awards	0
Equity incentive plan - October 11, 2006 \| November 26, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Final vesting date	Dec. 31, 2015
Total shares granted	5,264
Grand date fair value	$ 196.27
Shares vested	5,264
Non-vested share awards	0
Equity incentive plan - October 11, 2006 \| November 26, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Final vesting date	Dec. 31, 2015
Total shares granted	316
Grand date fair value	$ 196.27
Shares vested	316
Non-vested share awards	0
Equity incentive plan - October 11, 2006 \| December 19, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Final vesting date	Dec. 31, 2015
Total shares granted	422
Grand date fair value	$ 242.44
Shares vested	422
Non-vested share awards	0
Equity incentive plan - October 11, 2006 \| January 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Final vesting date	Dec. 31, 2015
Total shares granted	841
Grand date fair value	$ 253.46
Shares cancelled	196
Shares vested	645
Non-vested share awards	0

The number of share awards that have been vested as of the balance sheet date.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Date the equity-based award expires, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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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