Comprehensive Income (Components Of Other Comprehensive Income (Loss) And Allocated Income Tax (Expense) Benefit) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Comprehensive Income [Abstract]
Total comprehensive income	$ 1,300,000	$ 150,500,000	$ 22,300,000	$ 214,500,000
Foreign currency translation adjustments, Before-Tax Amount	(3,760,000)	2,506,000	(2,015,000)	(556,000)
Foreign currency translation adjustments, Tax (Expense) Benefit	1,316,000	(877,000)	705,000	195,000
Foreign currency translation adjustments, Net-of-Tax Amount	(2,444,000)	1,629,000	(1,310,000)	(361,000)
Derivative losses on cash flow hedges, Before-Tax Amount (See Note 3)	(549,000)	(2,089,000)	(1,992,000)	(6,072,000)
Derivative losses on cash flow hedges, Tax (Expense) Benefit (See Note 3)	192,000	731,000	697,000	2,125,000
Derivative losses on cash flow hedges, Net-of-Tax Amount (See Note 3)	(357,000)	(1,358,000)	(1,295,000)	(3,947,000)
Other comprehensive income (loss), Before-Tax Amount	(4,309,000)	417,000	(4,007,000)	(6,628,000)
Other comprehensive income (loss), Tax (Expense) Benefit	1,508,000	(146,000)	1,402,000	2,320,000
Other comprehensive income (loss), Net-of-Tax Amount	$ (2,801,000)	$ 271,000	$ (2,605,000)	$ (4,308,000)