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Earnings (loss) percommon share (Details 12) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Abstract]
Weighted average common shares outstanding - basic	194,136us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	193,949us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	192,060us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	189,820us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	188,929us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	188,831us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	188,831us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	188,831us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	192,507us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	188,855us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	188,826us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive performance share awards									80us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	838us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	0us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted average common shares outstanding - diluted	194,219us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	194,300us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	192,659us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	190,432us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	189,766us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	189,638us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	189,463us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	189,222us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	192,587us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	189,693us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	188,826us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Shares excluded from the calculation of diluted earnings per share									0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	58us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ 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 (c)

-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

-Glossary Antidilution

-URI http://asc.fasb.org/extlink&oid=6505113



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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Diluted Earnings Per Share

-URI http://asc.fasb.org/extlink&oid=6510752



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Contingent Stock Agreement

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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

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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

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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

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



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