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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Staff Accounting Bulletin (SAB)
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-Section I
-Subsection 7

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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Interest Rate Swap Agreements (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011 Interest Rate Swap Expiry Date One [Member] Interest Rate Swap Liabilities Two [Member]	Jun. 30, 2011 Interest Rate Swap Expiry Date Two [Member] Interest Rate Swap Liabilities Two [Member]	Jun. 30, 2011 Interest Rate Swap Assets One [Member]	Jun. 30, 2011 Interest Rate Swap Assets Two [Member]	Jun. 30, 2011 Interest Rate Swap Liabilities One [Member]	Jun. 03, 2011 Interest Rate Swap Liabilities One [Member]	Jun. 03, 2011 Interest Rate Swap Liabilities One [Member] Nondesignated [Member]	Jun. 30, 2011 Interest Rate Swap Liabilities Two [Member]	Jun. 03, 2011 Interest Rate Swap Liabilities Two [Member]	Jun. 30, 2011 Interest Rate Swap Liabilities Two [Member] Other Current Liabilities [Member]	Jun. 30, 2011 Interest Rate Swap Liabilities Two Sub Part One [Member]	Jun. 30, 2011 Interest Rate Swap Liabilities Two Sub Part Two [Member]	Jun. 03, 2011 Interest Rate Swap Liabilities Two Sub Part Two [Member] Nondesignated [Member]	Jun. 03, 2011 Nondesignated [Member]
Interest rate swap agreements designated as hedge agreements
Amount Hedged	$ 605,917				$ 175,000	$ 175,000	$ 106,632			$ 149,285
Effective Date					Dec. 13, 2010	Dec. 13, 2010	Aug. 13, 2007			Nov. 14, 2008
Pay Rate					1.40%	1.3975%	4.922%			3.63%
Receive Rate					1-Month LIBOR	1-Month LIBOR	3-Month LIBOR			1-Month LIBOR
Expiration Date					Sep. 13, 2015	Sep. 13, 2015	Aug. 12, 2012						Nov. 01, 2011	Nov. 01, 2012
Estimated Fair Value Of Asset	2,943				1,500	1,443						1,266
Estimated fair value of liabilities	(10,952)				(6,415)	(4,537)
Interest Rate Swap Agreements (Textuals) [Abstract]
Expiration date of Interest Rate Swaps			85,310
Expiration date of Interest Rate Swaps				63,975
Estimated Fair Value Of Asset	2,943				1,500	1,443						1,266
Interest Rate Swap Liabilities, Total								125,000	18,368		175,000				25,715
Additional amount expires this year																14,690
Additional amount expires next year																11,025
Interest Rate Swap Agreements Additional (Textuals) [Abstract]
Number of interest rate swap agreements	4
Net of deferred taxes	5,881	(14,176)
Amortized Interest Expenses related to a previously terminated interest rate swap agreement	2,259	2,317
Interest expense on Interest rate swap agreement will amortize over the next twelve months	3,953
Number of swap agreements used for hedging interest payments	2
Reclassification of accumulated other comprehensive income as a component of loss on early retirement of debt	$ 2,760