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Operating Leases (Future Minimum Annual Rentals) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Operating Leased Assets [Line Items]
2012	$ 101,849
2013	71,465
2014	44,921
2015	24,683
2016	10,687
2017 and thereafter	0
Total	253,605
Leased Facilities [Member]
Operating Leased Assets [Line Items]
2012	84,519
2013	62,386
2014	40,795
2015	24,683
2016	10,687
2017 and thereafter	0
Total	223,070
Leased Vehicles [Member]
Operating Leased Assets [Line Items]
2012	17,330
2013	9,079
2014	4,126
2015	0
2016	0
2017 and thereafter	0
Total	$ 30,535

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The total of future contractually required payments on leases defined as operating.

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For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within one year of the balance sheet date relating to leases defined as operating.

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For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within the third year of the balance sheet date relating to leases defined as operating.

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