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Per Common Share Amounts (Details) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Weighted average common shares outstanding (basic)	149,792us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	149,573us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted average common shares outstanding (diluted)	150,906us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	149,691us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Contingently Issuable Common Shares
Weighted Average Number Diluted Shares Outstanding Adjustment	1,091us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment / us-gaap_AwardTypeAxis = us-gaap_StockCompensationPlanMember	103us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment / us-gaap_AwardTypeAxis = us-gaap_StockCompensationPlanMember
Unvested Share Awards
Weighted Average Number Diluted Shares Outstanding Adjustment	23us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	15us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember

X

- Definition

The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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X

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 16

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256

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- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Weighted-Average Number of Common Shares Outstanding

-URI http://asc.fasb.org/extlink&oid=6528421

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