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Secured and Unsecured Debt (Details 5) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Aggregate maturities of unsecured debt
2013	$ 168,119
2014	357,946
2015	691,618
2016	570,933
2017	243,378
Thereafter	1,467,113
Unsecured Debt, Total	2,073,444	1,979,198
Long-term Debt	3,499,107	3,409,333
Secured Debt [Member]
Aggregate maturities of unsecured debt
2013	46,343
2014	46,369
2015	197,229
2016	138,449
2017	243,378
Thereafter	753,895
Long-term Debt	1,425,663
Unsecured Debt [Member]
Aggregate maturities of unsecured debt
2013	121,776
2014	311,577
2015	494,389
2016	432,484
2017	0
Thereafter	713,218
Unsecured Debt, Total	2,073,444	1,979,198
Long-term Debt	2,073,444
Variable Rate Debt [Member] | Secured Debt [Member]
Aggregate maturities of unsecured debt
2013	37,415
2014	0
2015	0
2016	0
2017	65,000
Thereafter	241,109
Long-term Debt	343,524
Fixed Rate Debt [Member] | Secured Debt [Member]
Aggregate maturities of unsecured debt
2013	8,928
2014	46,369
2015	197,229
2016	138,449
2017	178,378
Thereafter	512,786
Long-term Debt	$ 1,082,139

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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