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	$ 572,276	$ 597,467		$ (25,191)	$ 59,784
Net Income (Loss) Available to Common Stockholders, Basic	31,500
Dividends, Common Stock	(25,328)
Stock Issued During Period, Value, Other	125	125
Preferred Stock Dividends, Income Statement Impact	803
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	(803)
Payments of Ordinary Dividends, Common Stock	(25,328)
Other Comprehensive Income (Loss), Net of Tax	0
Net Income (Loss) Available to Common Stockholders, Basic	95,211
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	95,211
Preferred Stock Dividends, Income Statement Impact	2,410
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	(2,410)
Payments of Ordinary Dividends, Common Stock	(85,189)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	578,573	597,592		(19,019)	59,784
Net Income (Loss) Available to Common Stockholders, Basic	22,442
Dividends, Common Stock	(25,939)
Stock Issued During Period, Value, Other	79	79
Preferred Stock Dividends, Income Statement Impact	804
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	(804)
Payments of Ordinary Dividends, Common Stock	(25,939)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	575,155	597,671		(22,516)	59,784
Other Comprehensive Income (Loss), Net of Tax	0
Net Income (Loss) Available to Common Stockholders, Basic	41,269
Dividends, Common Stock	(33,922)
Stock Issued During Period, Value, Other	65	65
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	41,269
Preferred Stock Dividends, Income Statement Impact	803
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	(803)
Payments of Ordinary Dividends, Common Stock	(33,922)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	582,567	597,736		(15,169)	59,784
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	573,266	597,824		(24,558)	59,784
Other Comprehensive Income (Loss), Net of Tax	(5,539)
Net Income (Loss) Available to Common Stockholders, Basic	40,982
Dividends, Common Stock	(31,590)
Stock Issued During Period, Value, Other	34	34
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	35,443
Preferred Stock Dividends, Income Statement Impact	803
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	(803)
Payments of Ordinary Dividends, Common Stock	(31,590)
Other Comprehensive Income (Loss), Net of Tax	(29,722)
Net Income (Loss) Available to Common Stockholders, Basic	102,794
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	73,072
Preferred Stock Dividends, Income Statement Impact	2,410
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	(2,410)
Payments of Ordinary Dividends, Common Stock	(94,699)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	577,153	597,858	$ (5,539)	(15,166)	59,784
Other Comprehensive Income (Loss), Net of Tax	(11,649)
Net Income (Loss) Available to Common Stockholders, Basic	14,109
Dividends, Common Stock	(28,345)
Stock Issued During Period, Value, Other	59	59
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	2,460
Preferred Stock Dividends, Income Statement Impact	804
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	(804)
Payments of Ordinary Dividends, Common Stock	(28,345)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	551,327	597,917	(17,188)	(29,402)	59,784
Other Comprehensive Income (Loss), Net of Tax	(12,534)
Net Income (Loss) Available to Common Stockholders, Basic	47,703
Dividends, Common Stock	(34,764)
Stock Issued During Period, Value, Other	54	54
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	35,169
Preferred Stock Dividends, Income Statement Impact	803
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	(803)
Payments of Ordinary Dividends, Common Stock	(34,764)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 551,786	$ 597,971	$ (29,722)	$ (16,463)	$ 59,784