Unaudited Condensed Consolidated Statements of Common Stockholders' Equity ( Deficit) Statement - USD ($) $ in Thousands	Total	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Cumulative Preferred Stock Of Subsidiary [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 546,476	$ 590,784		$ (24,558)	$ 59,784
Other Comprehensive Income (Loss), Net of Tax	(36,313)
Net Income (Loss) Available to Common Stockholders, Basic	35,180
Dividends, Common Stock	(26,631)
Stock Issued During Period, Value, Other	49	49
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	(1,133)
Preferred Stock Dividends, Income Statement Impact	803
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	(803)
Payments of Ordinary Dividends, Common Stock	(26,631)
Other Comprehensive Income (Loss), Net of Tax	(33,944)
Net Income (Loss) Available to Common Stockholders, Basic	92,995
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	59,051
Preferred Stock Dividends, Income Statement Impact	2,410
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	(2,410)
Return of Capital		(1,000)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	518,761	590,833	$ (56,063)	(16,009)	59,784
Other Comprehensive Income (Loss), Net of Tax	(2,682)
Net Income (Loss) Available to Common Stockholders, Basic	18,319
Dividends, Common Stock	(26,596)
Stock Issued During Period, Value, Other	37	37
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	15,637
Preferred Stock Dividends, Income Statement Impact	804
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	(804)
Payments of Ordinary Dividends, Common Stock	(26,596)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	507,839	590,870	(58,745)	(24,286)	59,784
Other Comprehensive Income (Loss), Net of Tax	5,051
Net Income (Loss) Available to Common Stockholders, Basic	39,496
Dividends, Common Stock	(40,766)
Stock Issued During Period, Value, Other	39	39
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	44,547
Preferred Stock Dividends, Income Statement Impact	803
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	(803)
Return of Capital		(998)
Payments of Ordinary Dividends, Common Stock	(39,768)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	511,659	589,911	(53,694)	(24,558)	59,784
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	520,988	588,966		(24,558)	59,784
Other Comprehensive Income (Loss), Net of Tax	29,594
Net Income (Loss) Available to Common Stockholders, Basic	37,981
Dividends, Common Stock	(30,073)
Stock Issued During Period, Value, Other	41	41
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	67,575
Preferred Stock Dividends, Income Statement Impact	803
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	(803)
Payments of Ordinary Dividends, Common Stock	(30,073)
Other Comprehensive Income (Loss), Net of Tax	16,083
Net Income (Loss) Available to Common Stockholders, Basic	95,631
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	111,714
Preferred Stock Dividends, Income Statement Impact	2,410
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	(2,410)
Return of Capital		(8,200)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	558,531	589,007	(13,826)	(16,650)	59,784
Other Comprehensive Income (Loss), Net of Tax	(15,767)
Net Income (Loss) Available to Common Stockholders, Basic	16,406
Dividends, Common Stock	(32,506)
Stock Issued During Period, Value, Other	16	16
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	639
Preferred Stock Dividends, Income Statement Impact	804
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	(804)
Return of Capital		(8,192)
Payments of Ordinary Dividends, Common Stock	(24,314)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	526,680	580,831	(29,593)	(24,558)	59,784
Other Comprehensive Income (Loss), Net of Tax	2,256
Net Income (Loss) Available to Common Stockholders, Basic	41,244
Dividends, Common Stock	(33,523)
Stock Issued During Period, Value, Other	24	24
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	43,500
Preferred Stock Dividends, Income Statement Impact	803
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	(803)
Return of Capital		0
Payments of Ordinary Dividends, Common Stock	(33,523)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 536,681	$ 580,855	$ (27,337)	$ (16,837)	$ 59,784