Summary of Significant Accounting Policies (Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Component of Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrealized gains on investment securities available for sale, net of income taxes of $37,219, $26,749, and $8,886, respectively	$ 53,985	$ 39,136	$ 13,001
Net unrealized losses on long-term investment accounted for under the equity method, net of income tax benefits of $1,156, $418, and $458, respectively	(1,658)	(612)	(670)
Forward contracts adjustment, net of income taxes of $36, $63, and $88, respectively	(55)	(92)	(129)
Pension-related amounts, net of income taxes of $12,167, $10,644, and $15,358, respectively	(17,732)	(15,572)	(22,470)
Accumulated other comprehensive income (loss)	34,540	22,860	(10,268)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Component of Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) income, tax effect	37,219	26,749	8,886
Accumulated Net Unrealized Long-Term Equity Method Investment Gain (Loss) [Member]
Component of Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) income, tax effect	1,156	418	458
Accumulated Translation Adjustment [Member]
Component of Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) income, tax effect	36	63	88
Accumulated Defined Benefit Plans Adjustment [Member]
Component of Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) income, tax effect	$ 12,167	$ 10,644	$ 15,358