Condensed Consolidated Statements of Changes in Owners' Equity Statement - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]
Beginning balance at Dec. 31, 2017	$ 1,658,365	$ 786	$ 1,770,117	$ (8,031)	$ (50,706)	$ (53,801)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(27,300)	0	0	0	(27,300)	0
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | Accounting Standards Update 2014-09 [Member]	11,513	0	0	0	11,513	0
Other Comprehensive Income (Loss), Net of Tax	27,703	0	0	0	0	27,703
Dividends	(111,445)	0	(111,445)	0	0	0
Preferred Stock Dividends, Income Statement Impact	(11,023)		(11,023)
Dividend, Share-based Payment Arrangement, Cash	(406)	0	(406)	0	0	0
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	8,246	0	8,246	0	0	0
Proceeds from Noncontrolling Interests	0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	1,031	2	1,029
Treasury Stock, Value, Acquired, Cost Method	(699)			(699)
Treasury Stock, Retired, Cost Method, Amount	0	(2)	0	8,031	(8,029)	0
Ending balance at Sep. 30, 2018	1,555,985	786	1,656,518	(699)	(74,522)	(26,098)
Beginning balance at Jun. 30, 2018	1,584,518	785	1,696,865	(699)	(82,983)	(29,450)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	8,461	0	0	0	8,461	0
Other Comprehensive Income (Loss), Net of Tax	3,352	0	0	0	0	3,352
Dividends	(37,022)	0	(37,022)	0	0	0
Preferred Stock Dividends, Income Statement Impact	(6,193)	0	(6,193)	0	0	0
Dividend, Share-based Payment Arrangement, Cash	(342)	0	(342)	0	0	0
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	2,701	0	2,701	0	0	0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	510	1	509	0	0	0
Ending balance at Sep. 30, 2018	1,555,985	786	1,656,518	(699)	(74,522)	(26,098)
Beginning balance at Dec. 31, 2018	1,840,321	786	1,615,969	(705)	(73,971)	(51,247)	$ 349,489
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(21,678)	0	0	0	(44,934)	0	23,256
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | Accounting Standards Update 2018-02 [Member]	0	0	0	0	10,884	(10,884)	0
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | Accounting Standards Update 2016-02 [Member]	162	0	0	0	162	0	0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	17,721	0	0	0	0	8,728	8,993
Other Comprehensive Income (Loss), Net of Tax	6,837
Dividends	(112,929)	0	(112,929)	0	0	0	0
Preferred Stock Dividends, Income Statement Impact	(19,627)	0	(19,627)	0	0	0	0
Dividend, Share-based Payment Arrangement, Cash	395	0	395	0	0	0	0
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	7,672	0	7,672	0	0	0	0
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	383,918	0	(64,525)	0	0	0	448,443
Dividends, Subsidiary Preferred Stock, Paid-in-kind	(7,171)	0	(3,657)	0	0	0	(3,514)
Preferred Stock, Accretion of Redemption Discount	(27,926)	0	(14,241)	0	0	0	(13,685)
Proceeds from Noncontrolling Interests	103,691	0	0	0	0	0	103,691
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(90,830)	0	0	0	0	0	(90,830)
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	719	4	715	0	0	0	0
Treasury Stock, Value, Acquired, Cost Method	(736)	0	0	(736)	0	0	0
Ending balance at Sep. 30, 2019	2,073,702	790	1,409,772	(1,441)	(107,859)	(53,403)	825,843
Beginning balance at Jun. 30, 2019	2,117,346	790	1,453,679	(1,421)	(95,351)	(51,691)	811,340
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(5,466)	0	0	0	(12,508)	0	7,042
Other Comprehensive Income (Loss), Net of Tax	(6,317)	0	0	0	0	(1,712)	(4,605)
Dividends	(37,193)	0	(37,193)	0	0	0	0
Preferred Stock Dividends, Income Statement Impact	(6,657)	0	(6,657)	0	0	0	0
Dividend, Share-based Payment Arrangement, Cash	(489)	0	(489)	0	0	0	0
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	2,808	0	2,808	0	0	0	0
Dividends, Subsidiary Preferred Stock, Paid-in-kind	(5,000)	0	(2,550)	0	0	0	(2,450)
Preferred Stock, Accretion of Redemption Discount	(502)	0	(255)	0	0	0	(247)
Proceeds from Noncontrolling Interests	33,170	0	0	0	0	0	33,170
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(18,407)	0	0	0	0	0	(18,407)
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	429	0	429	0	0	0	0
Treasury Stock, Value, Acquired, Cost Method	(20)	0	0	(20)	0	0	0
Ending balance at Sep. 30, 2019	$ 2,073,702	$ 790	$ 1,409,772	$ (1,441)	$ (107,859)	$ (53,403)	$ 825,843