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Fair value measurements (Details 3) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2012
--- | --- | --- | ---
Carrying amount [Member] |  |  |
Fair value, balance sheet grouping [Line Items] |  |  |
Long-term debt | $ 2,011,896 | $ 1,744,975 | $ 1,742,977
Fair value [Member] |  |  |
Fair value, balance sheet grouping [Line Items] |  |  |
Long-term debt | $ 2,106,887 | $ 1,888,135 | $ 1,906,673

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13476-108611 + Details
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