Equity Level 4 (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Treasury Stock, Shares, Acquired	1,974,053	11,424,446		15,294,567
Common stock, par or stated value per share		$ 1	$ 1
Preferred Stock, Par or Stated Value Per Share		$ 1
Accumulated other comprehensive income [Roll Forward]
Balance at beginning of period	$ 59,414,000	$ 88,441,000
Other comprehensive income attributable to parent		(32,096,000)	(23,292,000)	5,892,000
Reclassification of foreign currency translation adjustments to discontinued operations		3,114,000	0	0
Balance at end of period		59,414,000	88,441,000
Treasury Stock, Value, Acquired, Par Value Method	45,100,000	241,700,000		184,900,000
Treasury Stock Acquired, Average Cost Per Share	$ 22.84	$ 21.15		$ 12.09
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated other comprehensive income [Roll Forward]
Balance at beginning of period		88,441,000	111,717,000	105,852,000
Other comprehensive income attributable to parent		(32,141,000)	(23,276,000)	5,865,000
Reclassification of foreign currency translation adjustments to discontinued operations		3,114,000
Decrease in net unrealized gains associated with available-for-sale securities of the trusts, net of taxes		(166,570,000)	(113,553,000)	95,686,000
Reclassification of net unrealized loss activity		166,570,000	113,553,000	(95,686,000)
Balance at end of period		59,414,000	88,441,000	111,717,000
Foreign Currency Gain (Loss) [Member]
Accumulated other comprehensive income [Roll Forward]
Balance at beginning of period		88,441,000	111,717,000	105,852,000
Other comprehensive income attributable to parent		(32,141,000)	(23,276,000)	5,865,000
Decrease in net unrealized gains associated with available-for-sale securities of the trusts, net of taxes		0	0	0
Reclassification of net unrealized loss activity		0	0	0
Balance at end of period		59,414,000	88,441,000	111,717,000
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated other comprehensive income [Roll Forward]
Balance at beginning of period		0	0	0
Other comprehensive income attributable to parent		0		0
Reclassification of foreign currency translation adjustments to discontinued operations		0
Decrease in net unrealized gains associated with available-for-sale securities of the trusts, net of taxes		(166,570,000)	(113,553,000)	95,686,000
Reclassification of net unrealized loss activity		166,570,000	113,553,000	(95,686,000)
Balance at end of period		$ 0	$ 0	$ 0