Summary of Significant Accounting Policies (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Component of Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrealized gains on investment securities available for sale, net of income taxes of $7,758, $12,706 and $11,528, respectively	$ 12,048	$ 18,102	$ 16,867
Net unrealized losses on long-term investment accounted for under the equity method, net of income tax benefits of $0, $1,156, and $418, respectively	0	(1,658)	(612)
Forward contracts adjustment, net of income taxes of $11, $36, and $63, respectively	(19)	(55)	(92)
Pension-related amounts, net of income taxes of $13,977, $12,167, and $10,644, respectively	(20,342)	(17,732)	(15,572)
Accumulated other comprehensive (loss) income	(8,313)	(1,343)	591
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Component of Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) income, tax effect	7,758	12,706	11,528
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	0	1,156	418
Accumulated Translation Adjustment [Member]
Component of Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) income, tax effect	11	36	63
Accumulated Defined Benefit Plans Adjustment [Member]
Component of Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) income, tax effect	$ 13,977	$ 12,167	$ 10,644