CONSOLIDATED STATEMENTS OF EQUITY Statement - USD ($) shares in Thousands, $ in Thousands	Total	Common Class C, Non-Voting [Member]	Preferred Stock [Member]	Preferred Stock [Member] Common Class C, Non-Voting [Member]	Common Stock [Member]	Common Stock [Member] Common Class C, Non-Voting [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] Common Class C, Non-Voting [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Other Comprehensive Income (Loss) [Member] Common Class C, Non-Voting [Member]	Retained Earnings [Member]	Retained Earnings [Member] Common Class C, Non-Voting [Member]	Noncontrolling Interest [Member]	Noncontrolling Interest [Member] Common Class C, Non-Voting [Member]
Beginning Balance (Shares Outstanding) at Dec. 31, 2015			8,400		10,687
Beginning Balance at Dec. 31, 2015	$ (553,720)		$ (204,759)		$ (10,687)		$ (117,862)		$ 11,019		$ (231,228)		$ (203)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	77,334		0		0		0		0		77,334		0
Less: Net loss attributable to non-controlling interest	34		0		0		0		0		0		(34)
Other comprehensive income, net of tax	44,777		0		0		0		44,777		0		0
Dividends, Preferred Stock, Cash	(13,182)		0		0		0		0		(13,182)		0
Dividends, Common Stock, Cash	(10,885)		0		0		0		0		(10,885)		0
Stock Issued During Period, Shares, New Issues				0		159
Stock Issued During Period, Value, New Issues		$ 693		$ 0		$ 159		$ 534		$ 0		$ 0		$ 0
Stock Repurchased and Retired During Period, Shares				0		(307)
Stock Repurchased and Retired During Period, Value		(9,088)		$ 0		$ (307)		0		0		(8,781)		0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	3,343		0		0		3,343		0		0		0
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net	(3,084)		$ 0		$ 0		(3,084)		0		0		0
Ending Balance (Shares Outstanding) at Dec. 31, 2016			8,400		10,539
Ending Balance at Dec. 31, 2016	643,647		$ 204,759		$ 10,539		118,655		33,758		275,714		222
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Noncontrolling Interest, Decrease from Deconsolidation	53		0		0		0		0		0		53
Net Income (Loss) Attributable to Parent	84,482		0		0		0		0		84,482		0
Less: Net loss attributable to non-controlling interest	165		0		0		0		0		0		(165)
Other comprehensive income, net of tax	8,274		0		0		0		8,274		0		0
Reclass of Stranded Tax Effects from AOCI to Retained Earnings	0		0		0		0		9,053		(9,053)		0
Dividends, Preferred Stock, Cash	(13,182)		0		0		0		0		(13,182)		0
Dividends, Common Stock, Cash	(15,257)		0		0		0		0		(15,257)		0
Stock Issued During Period, Shares, New Issues				0		80
Stock Issued During Period, Value, New Issues		311		$ 0		$ 80		231		0		0		0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	2,701		0		0		2,701		0		0		0
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net	(2,608)		$ 0		$ 0		(2,608)		0		0		0
Ending Balance (Shares Outstanding) at Dec. 31, 2017			8,400		10,619
Ending Balance at Dec. 31, 2017	708,146		$ 204,759		$ 10,619		118,979		51,085		322,704		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Noncontrolling Interest, Decrease from Deconsolidation	(57)		0		0		0		0		0		(57)
Cumulative Effect of New Accounting Principle in Period of Adoption	498		0		0		0		27		471		0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	708,644		204,759		10,619		118,979		51,112		323,175		0
Net Income (Loss) Attributable to Parent	108,080		0		0		0		0		108,080		0
Less: Net loss attributable to non-controlling interest	0
Other comprehensive income, net of tax	(26,156)		0		0		0		(26,156)		0		0
Dividends, Preferred Stock, Cash	(13,182)		0		0		0		0		(13,182)		0
Dividends, Common Stock, Cash	(24,722)		0		0		0		0		(24,722)		0
Stock Issued During Period, Shares, New Issues				0		50
Stock Issued During Period, Value, New Issues		$ 57		$ 0		$ 50		$ 7		$ 0		$ 0		$ 0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	2,518		0		0		2,518		0		0		0
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net	(2,682)		$ 0		$ 0		(2,682)		0		0		0
Ending Balance (Shares Outstanding) at Dec. 31, 2018			8,400		10,669
Ending Balance at Dec. 31, 2018	$ 752,557		$ 204,759		$ 10,669		$ 118,822		$ 24,956		$ 393,351		$ 0