Accumulated Other Comprehensive Income (Loss) (AOCI balances) (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Cumulative Foreign Currency Translation Adjustment, beginning balance	$ 26,072	$ 21,338
Cumulative Foreign Currency Translation Adjustment - Other comprehensive income (loss) before reclassifications	(1,059)	5,622	(16,268)
Cumulative Foreign Currency Translation Adjustment - Net amount reclassified from accumulated other comprehensive income	0	(888)
Cumulative Foreign Currency Translation Adjustment - Net other comprehensive income (loss)	(1,059)	4,734
Cumulative Foreign Currency Translation Adjustment, ending balance	25,013	26,072	21,338
Unrealized Gain on Available-for-Sale Securities, beginning balance	110,553	80,358
Unrealized Gain on Available-for-Sale Securities - Other comprehensive income (loss) before reclassifications	57,378	19,859
Unrealized Gain on Available-for-Sale Securities - Net amount reclassified from accumulated other comprehensive income	5,732	10,336	32,275
Unrealized Gain on Available-for-Sale Securities - Net other comprehensive income (loss)	63,110	30,195	9,651
Unrealized Gain on Available-for-Sale Securities, ending balance	173,663	110,553	80,358
Unrealized Gain on Pensions and Other Postretirement Plans, beginning balance	117,169	63,625
Unrealized Gain on Pensions and Other Postretirement Plans - Other comprehensive income (loss) before reclassifications	383,249	49,037
Unrealized Gain on Pensions and Other Postretirement Plans - Net amount reclassified from accumulated other comprehensive income	1,028	4,507
Unrealized Gain on Pensions and Other Postretirement Plans - Net other comprehensive income (loss)	384,277	53,544	(10,201)
Unrealized Gain on Pensions and Other Postretirement Plans, ending balance	501,446	117,169	63,625
Cash Flow Hedge, beginning balance	(940)	8
Cash Flow Hedge - Other comprehensive income (loss) before reclassifications	(178)	(1,132)
Cash Flow Hedge - Net amount reclassified from accumulated other comprehensive income	490	184
Cash Flow Hedge - Net other comprehensive income (loss)	312	(948)	8
Cash Flow Hedge, ending balance	(628)	(940)	8
Accumulated Other Comprehensive Income, beginning balance	252,854	165,329
Accumulated Other Comprehensive Income - Other comprehensive income (loss) before reclassifications	439,390	73,386
Accumulated Other Comprehensive Income - Net amount reclassified from accumulated other comprehensive income	7,250	14,139
Accumulated Other Comprehensive Income - Net other comprehensive income (loss)	446,640	87,525	(16,810)
Accumulated Other Comprehensive Income, ending balance	$ 699,494	$ 252,854	$ 165,329