Financial Instruments and Fair Value Measurements (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended												9 Months Ended				3 Months Ended		9 Months Ended							3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2010 Domestic [Member] Nonrecurring [Member] Continuing Operations [Member] Long Lived Assets, Fair Value Disclosure, Adjustments [Member]	Sep. 30, 2010 Import [Member] Nonrecurring [Member] Continuing Operations [Member] Long Lived Assets, Fair Value Disclosure, Adjustments [Member]	Sep. 30, 2010 Nonrecurring [Member] Level 3 [Member] Continuing Operations [Member] Fair Value [Member] Long Lived Assets, Fair Value Disclosure, Adjustments [Member]	Sep. 30, 2010 Nonrecurring [Member] Level 3 [Member] Continuing Operations [Member] Fair Value [Member] Long Lived Assets, Fair Value Disclosure, Impairment Loss [Member]	Sep. 30, 2010 Nonrecurring [Member] Level 3 [Member] Continuing Operations [Member] Fair Value [Member] Long Lived Assets, Fair Value Disclosure, Write-down Gain [Member]	Sep. 30, 2011 Nonrecurring [Member] Level 3 [Member] Discontinued Operations [Member] Fair Value [Member] Long Lived Assets, Fair Value Disclosure, Adjustments [Member]	Sep. 30, 2010 Nonrecurring [Member] Level 3 [Member] Discontinued Operations [Member] Fair Value [Member] Long Lived Assets, Fair Value Disclosure, Adjustments [Member]	Sep. 30, 2010 Nonrecurring [Member] Level 3 [Member] Discontinued Operations [Member] Fair Value [Member] Long Lived Assets, Fair Value Disclosure, Impairment Loss [Member]	Sep. 30, 2010 Nonrecurring [Member] Level 3 [Member] Discontinued Operations [Member] Fair Value [Member] Long Lived Assets, Fair Value Disclosure, Write-down Gain [Member]	Sep. 30, 2010 Nonrecurring [Member] Level 3 [Member] Fair Value [Member] Long Lived Assets, Fair Value Disclosure, Adjustments [Member]	Sep. 30, 2011 Nonrecurring [Member] Continuing Operations [Member]	Sep. 30, 2010 Nonrecurring [Member] Continuing Operations [Member] Carrying Value [Member] Long Lived Assets, Fair Value Disclosure, Adjustments [Member]	Sep. 30, 2010 Nonrecurring [Member] Continuing Operations [Member] Carrying Value [Member] Long Lived Assets, Fair Value Disclosure, Impairment Loss [Member]	Sep. 30, 2010 Nonrecurring [Member] Continuing Operations [Member] Carrying Value [Member] Long Lived Assets, Fair Value Disclosure, Write-down Gain [Member]	Sep. 30, 2011 Nonrecurring [Member] Continuing Operations [Member] Long Lived Assets, Fair Value Disclosure, Adjustments [Member]	Sep. 30, 2010 Nonrecurring [Member] Continuing Operations [Member] Long Lived Assets, Fair Value Disclosure, Adjustments [Member]	Sep. 30, 2011 Nonrecurring [Member] Continuing Operations [Member] Long Lived Assets, Fair Value Disclosure, Adjustments [Member]	Sep. 30, 2010 Nonrecurring [Member] Continuing Operations [Member] Long Lived Assets, Fair Value Disclosure, Adjustments [Member]	Sep. 30, 2010 Nonrecurring [Member] Continuing Operations [Member] Long Lived Assets, Fair Value Disclosure, Impairment Loss [Member]	Sep. 30, 2010 Nonrecurring [Member] Continuing Operations [Member] Long Lived Assets, Fair Value Disclosure, Write-down Gain [Member]	Sep. 30, 2011 Nonrecurring [Member] Discontinued Operations [Member] Carrying Value [Member] Long Lived Assets, Fair Value Disclosure, Adjustments [Member]	Sep. 30, 2010 Nonrecurring [Member] Discontinued Operations [Member] Carrying Value [Member] Long Lived Assets, Fair Value Disclosure, Impairment Loss [Member]	Sep. 30, 2010 Nonrecurring [Member] Discontinued Operations [Member] Carrying Value [Member] Long Lived Assets, Fair Value Disclosure, Write-down Gain [Member]	Sep. 30, 2011 Nonrecurring [Member] Discontinued Operations [Member] Long Lived Assets, Fair Value Disclosure, Adjustments [Member]	Sep. 30, 2010 Nonrecurring [Member] Discontinued Operations [Member] Long Lived Assets, Fair Value Disclosure, Adjustments [Member]	Sep. 30, 2011 Nonrecurring [Member] Discontinued Operations [Member] Long Lived Assets, Fair Value Disclosure, Adjustments [Member]	Sep. 30, 2010 Nonrecurring [Member] Discontinued Operations [Member] Long Lived Assets, Fair Value Disclosure, Adjustments [Member]	Sep. 30, 2010 Nonrecurring [Member] Discontinued Operations [Member] Long Lived Assets, Fair Value Disclosure, Impairment Loss [Member]	Sep. 30, 2010 Nonrecurring [Member] Discontinued Operations [Member] Long Lived Assets, Fair Value Disclosure, Write-down Gain [Member]	Sep. 30, 2010 Nonrecurring [Member] Long Lived Assets, Fair Value Disclosure, Adjustments [Member]	Sep. 30, 2011 Continuing Operations [Member] Carrying Value [Member]	Sep. 30, 2011 Discontinued Operations [Member] Carrying Value [Member]	Sep. 30, 2011 Carrying Value [Member]	Dec. 31, 2010 Carrying Value [Member]	Sep. 30, 2011 Fair Value [Member]	Dec. 31, 2010 Fair Value [Member]
Marketable securities																																					$ 1,700,000	$ 1,800,000	$ 1,700,000	$ 1,800,000
Goodwill impairment	0	0	0	0
Franchise rights impairment	0	0	0	0
Long-lived assets held and used measured at fair value							3,700,000									4,300,000
Long-lived assets held for sale					200,000	400,000									0				0	200,000		600,000
Long-lived assets held for sale measured at fair value							10,700,000	6,000,000	4,700,000	10,900,000	34,900,000	25,100,000	9,800,000	45,600,000			9,400,000	4,400,000							11,400,000	28,900,000	9,200,000								81,900,000	49,500,000
Impairment of long-lived assets held for sale																			0	2,600,000	0	3,100,000	3,400,000					0	600,000	500,000	3,200,000	3,800,000		6,300,000
Long-lived assets held for sale fair value adjustment																								$ 300,000									$ 600,000