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Fair value measurements (Details 3) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
Carrying amount [Member]
Fair value, balance sheet grouping [Line Items]
Long-term debt	$ 2,187,094	$ 1,854,563	$ 2,006,754
Fair value [Member]
Fair value, balance sheet grouping [Line Items]
Long-term debt, fair value	$ 2,283,351	$ 1,912,590	$ 2,090,208

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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