Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			3 Months Ended
Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Unrealized Gains (Losses) Investment Securities	Mar. 31, 2012 Unrealized Gains (Losses) Investment Securities	Mar. 31, 2013 Unrealized Gains (Losses) Cash Flow Hedges	Mar. 31, 2012 Unrealized Gains (Losses) Cash Flow Hedges	Mar. 31, 2012 Retirement Plan Liabilities Adjustments	Mar. 31, 2013 Retirement Plan Liabilities Adjustments	Dec. 31, 2012 Retirement Plan Liabilities Adjustments	Mar. 31, 2013 Foreign Currency Translation Adjustments	Mar. 31, 2012 Foreign Currency Translation Adjustments
Changes in accumulated other comprehensive income (loss)
Balance at beginning of period	$ 29,606	$ (25,538)	$ 17,255	$ 5,213	$ 104	$ 4,318	$ (35,221)	$ 8,120	$ 8,120	$ 4,127	$ 152
Other comprehensive income (loss) before reclassifications	2,038	32,775	(76)	5,537		10,237	13,609			2,114	3,392
Reclassification adjustments from accumulated other comprehensive income	(85)	(13,113)	19	(110)	(104)	(13,003)
Balance at end of period	$ 31,559	$ (5,876)	$ 17,198	$ 10,640		$ 1,552	$ (21,612)	$ 8,120	$ 8,120	$ 6,241	$ 3,544

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 130

-Paragraph 14, 17, 26

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e681-108580

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 31

-Article 5

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 15D

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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