Accumulated Other Comprehensive Income (Loss) (AOCI balances) (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income, beginning balance			$ 699,494
Other comprehensive income (loss) before reclassifications			20,570
Net amount reclassified from accumulated other comprehensive income			(172,179)
Other Comprehensive (Loss) Income, Net of Tax	(8,314)	7,184	(151,609)	47,417
Accumulated Other Comprehensive Income, ending balance	547,885		547,885
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income, beginning balance			25,013
Other comprehensive income (loss) before reclassifications			(7,111)
Net amount reclassified from accumulated other comprehensive income			0
Other Comprehensive (Loss) Income, Net of Tax			(7,111)
Accumulated Other Comprehensive Income, ending balance	17,902		17,902
Unrealized Gain on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income, beginning balance			173,663
Other comprehensive income (loss) before reclassifications			27,683
Net amount reclassified from accumulated other comprehensive income			(159,164)
Other Comprehensive (Loss) Income, Net of Tax			(131,481)
Accumulated Other Comprehensive Income, ending balance	42,182		42,182
Unrealized Gain on Pensions and Other Postretirement Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income, beginning balance			501,446
Other comprehensive income (loss) before reclassifications			0
Net amount reclassified from accumulated other comprehensive income			(13,402)
Other Comprehensive (Loss) Income, Net of Tax			(13,402)
Accumulated Other Comprehensive Income, ending balance	488,044		488,044
Cash Flow Hedge [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income, beginning balance			(628)
Other comprehensive income (loss) before reclassifications			(2)
Net amount reclassified from accumulated other comprehensive income			387
Other Comprehensive (Loss) Income, Net of Tax			385
Accumulated Other Comprehensive Income, ending balance	$ (243)		$ (243)