v2.4.0.6

Other long-term liabilities (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011
Other long-term liabilities |  |
Asset retirement obligations | $ 57,816 | $ 52,336
Net pension liability | 4,811 | 2,243
Deferred revenue | 4,919 | 1,623
Other | 3,828 | 1,657
Other long-term liabilities | 71,374 | 57,859
Movement in asset retirement obligations in acquisition of CPILP |  |
Asset retirement obligations beginning of year | 52,336 |
Asset retirement obligation additions | 3,466 |
Accretion of asset retirement obligations | 1,590 |
Translation adjustments | 424 |
Asset retirement obligations, end of year | $ 57,816 |

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