Long-Term Debt (Interest Expenses) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Cash payments for interest	$ 182,126		$ 168,665		$ 165,251
Accretion/amortization of discounts or premiums on loans	11,423		27,351		25,210
Amortization of net deferred hedge losses (see Note I)	349	[1]	2,018	[1]	573	[1]
Accretion of discount on postretirement benefit obligations	193		257		315
Amortization of capitalized loan fees	5,260		5,937		5,385
Net changes in accruals	(5,709)		10,842		(1,768)
Interest incurred	193,642		215,070		194,966
Less capitalized interest	(9,892)		(10,848)		(13,362)
Interest	183,750		204,222		181,604
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, before Tax	0		(4,855)		32,636
Interest Rate Derivatives [Member]
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, before Tax			$ (1,700)		$ (282)

[1] Includes interest rate derivative hedges of $1.7 million and $282 thousand for the periods ended December 31, 2012 and 2011, respectively, that were reclassified from AOCI - Hedging into earnings upon expiration (see Note E).