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Real estate (Details 7) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Future minimum lease obligations under non-cancelable operating leases
2013	$ 5,479
2014	4,835
2015	4,469
2016	4,582
2017	4,210
Net Lease Assets
Future minimum lease obligations under non-cancelable operating leases
2013	126,777
2014	129,622
2015	130,871
2016	128,347
2017	121,533
Operating Properties
Future minimum lease obligations under non-cancelable operating leases
2013	54,590
2014	53,516
2015	48,925
2016	46,426
2017	$ 43,754

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Amount of required minimum rental payments maturing in the next fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing in the fifth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing in the forth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing in the third fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing in the second fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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