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Fair value measurements (Details 3) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2012
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Carrying (reported) amount, fair value disclosure [Member] |  |  |
Fair value, balance sheet grouping, financial statement captions [Line Items] |  |  |
Long-term debt | $ 2,006,754 | $ 1,744,975 | $ 1,665,631
Estimate of fair value, fair value disclosure [Member] |  |  |
Fair value, balance sheet grouping, financial statement captions [Line Items] |  |  |
Long-term debt | $ 2,090,208 | $ 1,888,135 | $ 1,839,430

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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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- Details
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