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Long-term Debt and Short-term Borrowings (Principal Payments on Long-term Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Debt Instrument [Line Items]  
2013 $ 79,816
2014 260,394
2015 390,409
2016 225,368
2017 450,272
Thereafter 312,707
Total long-term debt 1,718,966
Parent Company [Member]
 
Debt Instrument [Line Items]  
2013 74,178
2014 0 [1]
2015 0
2016 0
2017 450,000
Thereafter 310,000
Total long-term debt 834,178
Subsidiaries [Member]
 
Debt Instrument [Line Items]  
2013 5,638
2014 260,394
2015 390,409
2016 225,368
2017 272
Thereafter 2,707
Total long-term debt $ 884,788
[1]