Accumulated Other Comprehensive Income (Loss) (Components of OCI) (Details 1) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Foreign currency translation adjustments:
Translation adjustments arising during the period, before tax	$ (10,548)	$ (9,777)	$ (17,387)	$ (7,111)
Translation adjustments arising during the period, income tax	0	0	0	0
Translation adjustments arising during the period, after tax	(10,548)	(9,777)	(17,387)	(7,111)
Adjustment for sales of businesses with foreign operations, before tax	6,026	0	5,501	0
Adjustment for sales of businesses with foreign operations, income tax	0	0	0	0
Adjustment for sales of businesses with foreign operations, after tax	6,026	0	5,501	0
Total foreign currency translation adjustments, before tax	(4,522)	(9,777)	(11,886)	(7,111)
Total foreign currency translation adjustments, income tax	0	0	0	0
Total foreign currency translation adjustments, after tax	(4,522)	(9,777)	(11,886)	(7,111)
Unrealized (losses) gains on available-for-sale securities:
Unrealized (losses) gains for the period, before tax	3,836	9,734	(16,497)	46,139
Unrealized (losses) gains for the period, tax	(1,535)	(3,894)	6,599	(18,456)
Unrealized (losses) gains for the period, after tax	2,301	5,840	(9,898)	27,683
Reclassification adjustment for realization of (gain) loss on exchange, sale or write-down of available-for-sale securities included in net income, before tax	0	0	0	(265,274)
Reclassification adjustment for realization of (gain) loss on exchange, sale or write-down of available-for-sale securities included in net income, income tax			0	106,110
Reclassification adjustment for realization of (gain) loss on exchange, sale or write-down of available-for-sale securities included in net income, after tax			0	(159,164)
Total unrealized gains (losses) on available-for-sale securities, before tax	3,836	9,734	(16,497)	(219,135)
Total unrealized (losses) gains on available-for-sale securities, income tax			6,599	87,654
Total unrealized (losses) gains on available-for-sale securities, after tax			(9,898)	(131,481)
Pension and other postretirement plans:
Amortization of net prior service cost (credit) included in net income	68	(101)	207	(305)
Amortization of net prior service cost (credit) included in net income, income tax	(27)	41	(82)	122
Amortization of net prior service cost (credit) included in net income, after tax	41	(60)	125	(183)
Amortization of net actuarial gain included in net income, before tax	(5,676)	(7,425)	(4,419)	(22,032)
Amortization of net actuarial gain included in net income, income tax	2,271	2,970	1,768	8,813
Amortization of net actuarial gain included in net income, after tax	(3,405)	(4,455)	(2,651)	(13,219)
Curtailment gains included in net income, before tax	51	0	51	0
Curtailment gains included in net income, income tax	(21)	0	(21)	0
Curtailment gains included in net income, after tax	30	0	30	0
Curtailment and settlement included in distribution to Cable ONE, before tax	1,403	0	1,403	0
Curtailment and settlement included in distribution to Cable ONE, income tax	(561)	0	(561)	0
Curtailment and settlement included in distribution to Cable ONE, after tax	842	0	842	0
Total pension and other postretirement plans, before tax	(4,154)	(7,526)	(2,758)	(22,337)
Total pension and other postretirement plans, income tax	1,662	3,011	1,104	8,935
Total pension and other postretirement plans, after tax	(2,492)	(4,515)	(1,654)	(13,402)
Cash flow hedge:
Gain for the period, before tax	0	230	179	641
Gain for the period, income tax	0	(92)	(71)	(256)
Gain for the period, after tax	0	138	108	385
Other Comprehensive Loss, before tax	(4,840)	(7,339)	(30,962)	(247,942)
Other Comprehensive Loss, income tax	127	(975)	7,632	96,333
Other Comprehensive Loss, after tax	$ (4,713)	$ (8,314)	$ (23,330)	$ (151,609)