Annual report pursuant to Section 13 and 15(d)

Commitment (Summary of minimum future lease arrangement cash receitps) (Details)

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Commitment (Summary of minimum future lease arrangement cash receitps) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Operating Leases, Future Minimum Payments Receivable [Abstract]  
2013 $ 11,322
2014 6,325
2015 5,094
2016 4,969
2017 4,949
2018 and thereafter 27,064
Total minimum future service revenues $ 59,723