Stockholders' Equity (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended																								9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Preferred stock	Sep. 30, 2013 Preferred stock	Sep. 30, 2014 Preference stock	Sep. 30, 2013 Preference stock	Sep. 30, 2014 Common stock	Sep. 30, 2013 Common stock	Sep. 30, 2014 Additional paid-in capital	Sep. 30, 2013 Additional paid-in capital	Sep. 30, 2014 Retained earnings	Sep. 30, 2013 Retained earnings	Sep. 30, 2014 Accumulated other comprehensive loss	Sep. 30, 2013 Accumulated other comprehensive loss	Sep. 30, 2014 Treasury stock	Sep. 30, 2013 Treasury stock	Dec. 31, 2012 Scenario, Previously Reported	Dec. 31, 2012 Scenario, Previously Reported Preferred stock	Dec. 31, 2012 Scenario, Previously Reported Preference stock	Dec. 31, 2012 Scenario, Previously Reported Common stock	Dec. 31, 2012 Scenario, Previously Reported Additional paid-in capital	Dec. 31, 2012 Scenario, Previously Reported Retained earnings	Dec. 31, 2012 Scenario, Previously Reported Accumulated other comprehensive loss	Dec. 31, 2012 Scenario, Previously Reported Treasury stock	Sep. 30, 2013 Restatement Adjustment	Sep. 30, 2013 Restatement Adjustment Preferred stock	Sep. 30, 2013 Restatement Adjustment Preference stock	Sep. 30, 2013 Restatement Adjustment Common stock	Sep. 30, 2013 Restatement Adjustment Additional paid-in capital	Sep. 30, 2013 Restatement Adjustment Retained earnings	Sep. 30, 2013 Restatement Adjustment Accumulated other comprehensive loss	Sep. 30, 2013 Restatement Adjustment Treasury stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balances, beginning of period			$ 205,176	$ 127,404	$ 4	$ 4	$ 591	$ 648	$ 323,338	$ 323,338	$ 196,977	$ 223,847	$ 4,715,564	$ 4,761,575	$ (574,556)	$ (681,213)	$ (4,456,742)	$ (4,500,795)	$ 110,631	$ 4	$ 648	$ 323,338	$ 223,847	$ 4,744,802	$ (681,213)	$ (4,500,795)
Retained earnings adjustment (see Note 15)																											16,773	0	0	0	0	16,773	0	0
Net income	132,289	(5,527)	271,227	52,746	0	0	0	0	0	0	0	0	271,227	52,746	0	0	0	0
Other comprehensive loss	(55,390)	26,930	(40,185)	(15,380)	0	0	0	0	0	0	0	0	0	0			0	0
Cash dividends
Common			(113,883)	(150,920)	0	0	0	0	0	0	0	0	(113,883)	(150,920)	0	0	0	0
Preference	(11)	(12)	(33)	(35)	0	0	0	0	0	0	0	0	(33)	(35)	0	0	0	0
Issuance of common stock			909	2,134	0	0	0	0	0	0	(26,591)	(33,412)	0	0	0	0	27,500	35,546
Conversion to common stock			0	0	(3)	0	(32)	(40)	0	0	(741)	(853)	0	0	0	0	776	893
Stock-based compensation expense			12,658	12,061	0	0	0	0	0	0	12,658	12,061	0	0	0	0	0	0
Purchase of subsidiary shares from noncontrolling interest			(7,520)		0		0		0		(7,520)		0		0		0
Repurchase of common stock			(50,003)		0		0		0		0		0		0		(50,003)
Balances, end of period	$ 278,346	$ 28,010	$ 278,346	$ 28,010	$ 1	$ 4	$ 559	$ 608	$ 323,338	$ 323,338	$ 174,783	$ 201,643	$ 4,872,875	$ 4,663,366	$ (614,741)	$ (696,593)	$ (4,478,469)	$ (4,464,356)	$ 110,631	$ 4	$ 648	$ 323,338	$ 223,847	$ 4,744,802	$ (681,213)	$ (4,500,795)