The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Debt (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Jan. 01, 2012	Sep. 30, 2012 Unsecured Debt [Member] Senior Notes	Jan. 01, 2012 Unsecured Debt [Member] Senior Notes	Sep. 30, 2012 Unsecured Debt [Member] 6.20% senior notes	Jan. 01, 2012 Unsecured Debt [Member] 6.20% senior notes	Sep. 30, 2012 Unsecured Debt [Member] 7% debentures	Jan. 01, 2012 Unsecured Debt [Member] 7% debentures	Sep. 30, 2012 Unsecured Debt [Member] 6.54% aircraft term loan	Jan. 01, 2012 Unsecured Debt [Member] 6.54% aircraft term loan	Sep. 30, 2012 Capital Lease Obligations [Member] Capital Lease Obligations	Jan. 01, 2012 Capital Lease Obligations [Member] Capital Lease Obligations	Sep. 30, 2012 Secured Debt [Member] Term Loan [Member]	May 15, 2012 Secured Debt [Member] Term Loan [Member]	Jan. 01, 2012 Secured Debt [Member] Term Loan [Member]	Jul. 16, 2012 Secured Debt [Member] Credit Agreement [Member]	Sep. 30, 2012 Secured Debt [Member] Term Loan, Repaid in May 2012	Jan. 01, 2012 Secured Debt [Member] Term Loan, Repaid in May 2012	Sep. 30, 2012 Secured Debt [Member] Sale-leaseback obligations	Jan. 01, 2012 Secured Debt [Member] Sale-leaseback obligations	Sep. 30, 2012 Secured Debt [Member] Other Debt	Jan. 01, 2012 Secured Debt [Member] Other Debt
Debt Instrument [Line Items]
Debt Instrument, Face Amount														$ 1,125,000
Long-term debt	1,457,328	1,356,999	0	554,901	226,176	224,643	83,207	82,342	0	11,303	31,353	15,222	1,114,415		0	1,113,750	0	466,062	1,471	1,466	706	1,060
Less amounts payable within one year	(10,000)	(6,597)
Long-term debt	1,447,328	1,350,402
Debt Instrument, Unamortized Discount																$ 11,250