Accumulated Other Comprehensive Income (Loss) (AOCI balances) (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Abstract]
Cumulative Foreign Currency Translation Adjustment, beginning balance			$ 26,072
Cumulative Foreign Currency Translation Adjustment - Other comprehensive income (loss) before reclassifications	5,639	5,321	(2,061)	4,233
Cumulative Foreign Currency Translation Adjustment - Net amount reclassified from accumulated other comprehensive income	0	1,409	0	888
Cumulative Foreign Currency Translation Adjustment - Net other comprehensive income (loss)	5,639	3,912	(2,061)	3,345
Cumulative Foreign Currency Translation Adjustment, ending balance	24,011		24,011
Unrealized Gain on Available-for-Sale Securities, beginning balance			110,553
Unrealized Gain on Available-for-Sale Securities - Other comprehensive income (loss) before reclassifications			48,864
Unrealized Gain on Available-for-Sale Securities - Net amount reclassified from accumulated other comprehensive income			(531)	(463)
Unrealized Gain on Available-for-Sale Securities - Net other comprehensive income (loss)	563	(3,579)	48,333	19,301
Unrealized Gain on Available-for-Sale Securities, ending balance	158,886		158,886
Unrealized Gain on Pensions and Other Postretirement Plans, beginning balance			117,169
Unrealized Gain on Pensions and Other Postretirement Plans - Other comprehensive income (loss) before reclassifications			0
Unrealized Gain on Pensions and Other Postretirement Plans - Net amount reclassified from accumulated other comprehensive income			990
Unrealized Gain on Pensions and Other Postretirement Plans - Net other comprehensive income (loss)	973	1,274	990	3,270
Unrealized Gain on Pensions and Other Postretirement Plans, ending balance	118,159		118,159
Cash Flow Hedge, beginning balance			(940)
Cash Flow Hedge - Other comprehensive income (loss) before reclassifications			(198)
Cash Flow Hedge - Net amount reclassified from accumulated other comprehensive income			353
Cash Flow Hedge - Net other comprehensive income (loss)	9	130	155	(695)
Cash Flow Hedge, ending balance	(785)		(785)
Accumulated Other Comprehensive Income, beginning balance			252,854
Accumulated Other Comprehensive Income - Other comprehensive income (loss) before reclassifications			46,605
Accumulated Other Comprehensive Income - Net amount reclassified from accumulated other comprehensive income			812
Accumulated Other Comprehensive Income - Net other comprehensive income (loss)	7,184	1,737	47,417	25,221
Accumulated Other Comprehensive Income, ending balance	$ 300,271		$ 300,271