Accumulated Other Comprehensive Income (Loss) (AOCI balances) (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income, beginning balance			$ 699,494
Other comprehensive income (loss) before reclassifications			24,499
Net amount reclassified from accumulated other comprehensive income			(167,794)
Other Comprehensive (Loss) Income, Net of Tax	(156,886)	16,245	(143,295)	40,233
Accumulated Other Comprehensive Income, ending balance	556,199		556,199
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			2,666
Net amount reclassified from accumulated other comprehensive income			0
Other Comprehensive (Loss) Income, Net of Tax			2,666
Accumulated Other Comprehensive Income, ending balance	27,679		27,679
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			21,843
Net amount reclassified from accumulated other comprehensive income			(159,164)
Other Comprehensive (Loss) Income, Net of Tax			(137,321)
Accumulated Other Comprehensive Income, ending balance	36,342		36,342
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			(8,887)
Other Comprehensive (Loss) Income, Net of Tax			(8,887)
Accumulated Other Comprehensive Income, ending balance	492,559		492,559
Cash Flow Hedge [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income, beginning balance			(628)
Other comprehensive income (loss) before reclassifications			(10)
Net amount reclassified from accumulated other comprehensive income			257
Other Comprehensive (Loss) Income, Net of Tax			247
Accumulated Other Comprehensive Income, ending balance	$ (381)		$ (381)