Shareholders' Equity Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period	$ (21,722)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(114,792)	12,662	2,776
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	(136,514)	(21,722)
Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period	(21,722)	(34,384)	(37,160)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(115,091)	13,610	2,944
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	299	(948)	(168)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(114,792)	12,662	2,776
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	(136,514)	(21,722)	(34,384)
Accumulated Other Comprehensive Income, Net Unrealized Gain (Loss) on Nonderivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period	(14,380)	(14,380)	(14,380)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0	0	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0	0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	0	0	0
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	(14,380)	(14,380)	(14,380)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period	(1,256)	(1,689)	0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(566)	2	(1,689)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	1,054	431	0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	488	433	(1,689)
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	(768)	(1,256)	(1,689)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period	3,799	(3,313)	(24,718)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(90,333)	7,112	21,405
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0	0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(90,333)	7,112	21,405
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	(86,534)	3,799	(3,313)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period	(9,885)	(15,002)	1,938
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(24,192)	6,496	(16,772)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(755)	(1,379)	(168)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(24,947)	5,117	(16,940)
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	$ (34,832)	$ (9,885)	$ (15,002)