Shareholders' Equity Schedule of Changes in Components of Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of Changes in Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), net	$ (37,160)
Other Comprehensive Income (Loss), Net of Tax	2,753	(2,440)	(106,217)
Accumulated other comprehensive income (loss), net	(34,384)	(37,160)
Parent [Member]
Schedule of Changes in Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), net	(37,160)	(34,974)	71,130
Other Comprehensive Income (Loss), Net of Tax	2,776	(2,186)	(106,104)
Accumulated other comprehensive income (loss), net	(34,384)	(37,160)	(34,974)
Parent [Member] | Foreign Currency Translation Adjustments [Member]
Schedule of Changes in Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), net	(24,718)	(26,026)	98,165
Other Comprehensive Income (Loss), Net of Tax	21,405	1,308	(124,191)
Accumulated other comprehensive income (loss), net	(3,313)	(24,718)	(26,026)
Parent [Member] | Net Unrealized Gain (Loss) on Derivative Instruments [Member]
Schedule of Changes in Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), net	0	(4,520)	(8,961)
Other Comprehensive Income (Loss), Net of Tax	(1,689)	4,520	4,441
Accumulated other comprehensive income (loss), net	(1,689)	0	(4,520)
Parent [Member] | Net Unrealized Gain (Loss) on Nonderivative Instruments [Member]
Schedule of Changes in Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), net	(14,380)	(5,514)	(21,339)
Other Comprehensive Income (Loss), Net of Tax	0	(8,866)	15,825
Accumulated other comprehensive income (loss), net	(14,380)	(14,380)	(5,514)
Parent [Member] | Pension Plan Benefit Liability Adjustments [Member]
Schedule of Changes in Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), net	1,938	1,086	3,265
Other Comprehensive Income (Loss), Net of Tax	(16,940)	852	(2,179)
Accumulated other comprehensive income (loss), net	$ (15,002)	$ 1,938	$ 1,086